null

SMILES NC(=N)NC(=O)c1nc(Cl)c(nc1N)N1CCCCCC1

InChI Key InChIKey=RQQJJXVETXFINY-UHFFFAOYSA-N

  Tab Delimited (TSV)   2D SDfile   Computed 3D by Vconf -m prep SDfile
Find this compound or compounds like it in BindingDB:
   Substructure
Similarity at least:  must be >=0.5
Exact match

Activity Spreadsheet -- Enzyme Inhibition Constant Data from BindingDB

Found 48 hits for monomerid = 81818   

TargetCalcium release-activated calcium channel protein 1(Homo sapiens (Human))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  54nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetMu-type opioid receptor(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  61nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine receptor 2A(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  400nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetAdenosine receptor A1(BOVINE)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  410nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetDelta-type opioid receptor(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  1.00E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetAdenosine receptor A1(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  1.20E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetUrokinase-type plasminogen activator(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  1.36E+3nMAssay Description:Inhibition of human kidney uPA using Z-Gly-Gly-Arg-AMC as substrate measured over 15 mins by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetMuscarinic acetylcholine receptor M2(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  2.90E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetMuscarinic acetylcholine receptor M1(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  3.60E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetKappa-type opioid receptor(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  3.90E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetAdenosine receptor A2a(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  4.60E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetMuscarinic acetylcholine receptor M3(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  4.70E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetAlpha-2C adrenergic receptor(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  5.20E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetHistamine H1 receptor(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  5.60E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine receptor 2C(PIG)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  6.70E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetSodium-dependent serotonin transporter(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  7.90E+3nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetUrokinase-type plasminogen activator(Mus musculus (Mouse))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi:  9.31E+3nMAssay Description:Inhibition of mouse uPA using Z-Gly-Gly-Arg-AMC as substrate after 15 mins by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetPro-thyrotropin-releasing hormone(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetProtachykinin-1(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetCysteinyl leukotriene receptor 1(GUINEA PIG)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetGlycine amidinotransferase, mitochondrial(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetGamma-aminobutyric acid receptor subunit alpha-1(Rattus norvegicus (Rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetGamma-aminobutyric acid receptor subunit alpha-1(Rattus norvegicus (Rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetD(2) dopamine receptor(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetD(1A) dopamine receptor(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetGastrin/cholecystokinin type B receptor(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetGastrin/cholecystokinin type B receptor(RAT)
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetVoltage-dependent calcium channel gamma-1 subunit(Homo sapiens (Human))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetBeta-1 adrenergic receptor(Rattus norvegicus (Rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetAlpha-1A adrenergic receptor(Rattus norvegicus (Rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine receptor 3A(Mus musculus (house mouse))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine 1D receptor(Bos taurus (Bovine))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine receptor 1B(Rattus norvegicus (Rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
Target5-hydroxytryptamine receptor 1A(Rattus norvegicus (rat))
Center for Bio-Pharmaceutical Sciences

Curated by PDSP Ki Database
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataKi: >1.00E+4nMMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2TH8K5JPubMed
TargetUrokinase-type plasminogen activator(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 6.00E+3nMAssay Description:Inhibition of urokinase-type plasminogen activatorMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2VT1SH8PubMed
TargetPlasma kallikrein(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 5.00E+4nMAssay Description:Inhibition of human plasma kallikrein using chromogenic L-pyroGlu-L-Pro-L-Arg-p-nitroaniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetTrypsin(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 1.00E+4nMAssay Description:Inhibition of trypsin (unknown origin) using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetAdenosine receptor A2a(Homo sapiens (Human))
Leiden University

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 5.10E+3nMAssay Description:Displacement of [3H]ZM-241,385 from human N-terminal FLAG-tagged adenosine A2A receptor expressed in HEK293 cell membrane by microbeta scintillation ...More data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2BC41GQPubMed
TargetVitamin K-dependent protein C(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 5.00E+4nMAssay Description:Inhibition of activated protein C (unknown origin) using chromogenic L-pyroGlu-L-Pro-L-Arg-p-nitroaniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetCoagulation factor X(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 5.00E+4nMAssay Description:Inhibition of factor 10a (unknown origin) using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetAdenosine receptor A2a/A2b(Homo sapiens (Human))
Leiden University

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 270nMAssay Description:Displacement of [3H]ZM-241,385 from human N-terminal FLAG-tagged adenosine A2A receptor W246A 6.48 mutant expressed in HEK293 cell membrane by microb...More data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2BC41GQPubMed
TargetTissue-type plasminogen activator(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 1.00E+4nMAssay Description:Inhibition of tPA (unknown origin) using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetUrokinase-type plasminogen activator(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 2.40E+3nMAssay Description:Inhibition of human kidney uPA using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetSodium channel protein type 5 subunit alpha(Homo sapiens (Human))TBA
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 3.00E+4nMAssay Description:Inhibition of recombinant human Nav1.5alpha expressed in HEK293 cells incubated for 10 mins by voltage clamp methodMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q21G0R0VPubMed
TargetProthrombin(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 1.00E+4nMAssay Description:Inhibition of thrombin (unknown origin) using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
TargetPlasminogen(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 1.00E+4nMAssay Description:Inhibition of plasmin (unknown origin) using chromogenic H-D-Ile-L-Pro-L-Arg-p-nitoraniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 3.30E+3nMAssay Description:Inhibition of recombinant human ERG expressed in CHO cells incubated for 12 mins by whole cell voltage clamp methodMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q21G0R0VPubMed
TargetCoagulation factor XI(Homo sapiens (Human))
University of Wollongong

Curated by ChEMBL
LigandPNGBDBM81818(CAS_1794 | CHEMBL1909810 | HMA | NSC_1794)copy SMILEScopy InChI
Affinity DataIC50: 5.00E+4nMAssay Description:Inhibition of factor 11a (unknown origin) using chromogenic L-pyroGlu-L-Pro-L-Arg-p-nitroaniline as substrate by fluorescence assayMore data for this Ligand-Target Pair
In DepthDetails Article
BindingDB Entry DOI: 10.7270/Q2QF8WH4PubMed