2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine

C149H138N26O7S — CID 159566442

IUPAC2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine
SMILESCCS(=O)(=O)c1ccc(-c2cc(-c3cn[nH]c3-c3cccc(C)n3)ccn2)cc1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(CN4CCOCC4)cc3)c2)n1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(OCCN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccc(O)cc2)n1.Cc1cccc(C2=NCC=C2c2ccnc(-c3ccc(CN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccnc3ccccc23)n1.c1ccc(-c2[nH]ncc2-c2ccc3c(c2)OCO3)nc1
InChIInChI=1S/C26H27N5O.C26H26N4.C25H25N5O.C22H20N4O2S.C19H15N3.C16H14N2O.C15H11N3O2/c1-19-5-4-6-24(29-19)23-18-28-30-26(23)21-11-12-27-25(17-21)20-7-9-22(10-8-20)32-16-15-31-13-2-3-14-31;1-19-5-4-6-24(29-19)26-23(12-14-28-26)22-11-13-27-25(17-22)21-9-7-20(8-10-21)18-30-15-2-3-16-30;1-18-3-2-4-23(28-18)22-16-27-29-25(22)21-9-10-26-24(15-21)20-7-5-19(6-8-20)17-30-11-13-31-14-12-30;1-3-29(27,28)18-9-7-16(8-10-18)21-13-17(11-12-23-21)19-14-24-26-22(19)20-6-4-5-15(2)25-20;1-13-5-4-8-18(22-13)19-16(10-12-21-19)14-9-11-20-17-7-3-2-6-15(14)17;1-11-3-2-4-15(18-11)16-14(9-10-17-16)12-5-7-13(19)8-6-12;1-2-6-16-12(3-1)15-11(8-17-18-15)10-4-5-13-14(7-10)20-9-19-13/h4-12,17-18H,2-3,13-16H2,1H3,(H,28,30);4-13,17H,2-3,14-16,18H2,1H3;2-10,15-16H,11-14,17H2,1H3,(H,27,29);4-14H,3H2,1-2H3,(H,24,26);2-11H,12H2,1H3;2-9,19H,10H2,1H3;1-8H,9H2,(H,17,18)
InChIKeyMHGIPWGGGLWANR-UHFFFAOYSA-N
MW2436.98 g/mol
LogP28.24
Rot. Bonds28

About 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine

2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine (PubChem CID 159566442) has the molecular formula C149H138N26O7S and a molecular weight of 2436.98 g/mol. Its IUPAC name is 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine.

Molecular Properties

Compound Name2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine
PubChem CID159566442
Molecular FormulaC149H138N26O7S
Molecular Weight2436.98 g/mol
Exact Mass2435.10
IUPAC Name2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine
SMILESCCS(=O)(=O)c1ccc(-c2cc(-c3cn[nH]c3-c3cccc(C)n3)ccn2)cc1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(CN4CCOCC4)cc3)c2)n1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(OCCN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccc(O)cc2)n1.Cc1cccc(C2=NCC=C2c2ccnc(-c3ccc(CN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccnc3ccccc23)n1.c1ccc(-c2[nH]ncc2-c2ccc3c(c2)OCO3)nc1
InChIInChI=1S/C26H27N5O.C26H26N4.C25H25N5O.C22H20N4O2S.C19H15N3.C16H14N2O.C15H11N3O2/c1-19-5-4-6-24(29-19)23-18-28-30-26(23)21-11-12-27-25(17-21)20-7-9-22(10-8-20)32-16-15-31-13-2-3-14-31;1-19-5-4-6-24(29-19)26-23(12-14-28-26)22-11-13-27-25(17-22)21-9-7-20(8-10-21)18-30-15-2-3-16-30;1-18-3-2-4-23(28-18)22-16-27-29-25(22)21-9-10-26-24(15-21)20-7-5-19(6-8-20)17-30-11-13-31-14-12-30;1-3-29(27,28)18-9-7-16(8-10-18)21-13-17(11-12-23-21)19-14-24-26-22(19)20-6-4-5-15(2)25-20;1-13-5-4-8-18(22-13)19-16(10-12-21-19)14-9-11-20-17-7-3-2-6-15(14)17;1-11-3-2-4-15(18-11)16-14(9-10-17-16)12-5-7-13(19)8-6-12;1-2-6-16-12(3-1)15-11(8-17-18-15)10-4-5-13-14(7-10)20-9-19-13/h4-12,17-18H,2-3,13-16H2,1H3,(H,28,30);4-13,17H,2-3,14-16,18H2,1H3;2-10,15-16H,11-14,17H2,1H3,(H,27,29);4-14H,3H2,1-2H3,(H,24,26);2-11H,12H2,1H3;2-9,19H,10H2,1H3;1-8H,9H2,(H,17,18)
InChIKeyMHGIPWGGGLWANR-UHFFFAOYSA-N
XLogP28.24
TPSA407.49 Ų
H-Bond Donors5
H-Bond Acceptors29
Rotatable Bonds28
Heavy Atoms183
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5002436.98
LogP ≤ 528.24
H-Bond Donors ≤ 55
H-Bond Acceptors ≤ 1029

Analyze 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine with MolForge

Explore ADMET properties, 3D molecular structure, drug-likeness score, and discover similar compounds using our AI-powered platform.

Launch Full Analysis

Related Compounds

Frequently Asked Questions

What is the IUPAC name of 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine?
The IUPAC name of 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine (CID 159566442) is 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine.
What is the SMILES notation for 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine?
The canonical SMILES for 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine is CCS(=O)(=O)c1ccc(-c2cc(-c3cn[nH]c3-c3cccc(C)n3)ccn2)cc1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(CN4CCOCC4)cc3)c2)n1.Cc1cccc(-c2cn[nH]c2-c2ccnc(-c3ccc(OCCN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccc(O)cc2)n1.Cc1cccc(C2=NCC=C2c2ccnc(-c3ccc(CN4CCCC4)cc3)c2)n1.Cc1cccc(C2=NCC=C2c2ccnc3ccccc23)n1.c1ccc(-c2[nH]ncc2-c2ccc3c(c2)OCO3)nc1.
What is the InChIKey of 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine?
The InChIKey is MHGIPWGGGLWANR-UHFFFAOYSA-N. The full InChI is InChI=1S/C26H27N5O.C26H26N4.C25H25N5O.C22H20N4O2S.C19H15N3.C16H14N2O.C15H11N3O2/c1-19-5-4-6-24(29-19)23-18-28-30-26(23)21-11-12-27-25(17-21)20-7-9-22(10-8-20)32-16-15-31-13-2-3-14-31;1-19-5-4-6-24(29-19)26-23(12-14-28-26)22-11-13-27-25(17-22)21-9-7-20(8-10-21)18-30-15-2-3-16-30;1-18-3-2-4-23(28-18)22-16-27-29-25(22)21-9-10-26-24(15-21)20-7-5-19(6-8-20)17-30-11-13-31-14-12-30;1-3-29(27,28)18-9-7-16(8-10-18)21-13-17(11-12-23-21)19-14-24-26-22(19)20-6-4-5-15(2)25-20;1-13-5-4-8-18(22-13)19-16(10-12-21-19)14-9-11-20-17-7-3-2-6-15(14)17;1-11-3-2-4-15(18-11)16-14(9-10-17-16)12-5-7-13(19)8-6-12;1-2-6-16-12(3-1)15-11(8-17-18-15)10-4-5-13-14(7-10)20-9-19-13/h4-12,17-18H,2-3,13-16H2,1H3,(H,28,30);4-13,17H,2-3,14-16,18H2,1H3;2-10,15-16H,11-14,17H2,1H3,(H,27,29);4-14H,3H2,1-2H3,(H,24,26);2-11H,12H2,1H3;2-9,19H,10H2,1H3;1-8H,9H2,(H,17,18).
What are the key properties of 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine?
2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine has a molecular weight of 2436.98 g/mol, XLogP of 28.24, 28 rotatable bonds, 5 hydrogen bond donors, and 29 hydrogen bond acceptors.
Where does this data come from?
All data for 2-[4-(1,3-benzodioxol-5-yl)-1H-pyrazol-5-yl]pyridine;2-[4-[2-(4-ethylsulfonylphenyl)-4-pyridinyl]-1H-pyrazol-5-yl]-6-methylpyridine;4-[[4-[4-[4-(6-methyl-2-pyridinyl)-1H-pyrazol-5-yl]-2-pyridinyl]phenyl]methyl]morpholine;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]phenol;4-[5-(6-methyl-2-pyridinyl)-2H-pyrrol-4-yl]quinoline;2-methyl-6-[5-[2-[4-(2-pyrrolidin-1-ylethoxy)phenyl]-4-pyridinyl]-1H-pyrazol-4-yl]pyridine;2-methyl-6-[4-[2-[4-(pyrrolidin-1-ylmethyl)phenyl]-4-pyridinyl]-2H-pyrrol-5-yl]pyridine is sourced from PubChem (CID 159566442), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).