(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one

C156H119Cl2F28N15O13 — CID 160668654

About (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one

(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one (PubChem CID 160668654) has the molecular formula C156H119Cl2F28N15O13 and a molecular weight of 3014.61 g/mol. Its IUPAC name is (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one.

Molecular Properties

• Compound Name: (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one
• PubChem CID: 160668654
• Molecular Formula: C156H119Cl2F28N15O13
• Molecular Weight: 3014.61 g/mol
• Exact Mass: 3011.80
• IUPAC Name: (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one
• SMILES: CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)CC2=CCc3ccc(O)cc32)Cc2cc(F)cc(F)c2)ccn1.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)CN2C(=O)Cc3cc(Cl)c(Cl)cc32)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)Cn2cc(C(N)=O)c(C(F)(F)F)n2)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)Cn2nc(C(F)(F)F)c3c2C(F)(F)CCC3)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cncnc2[C@@H](CC(=O)Cn2nc(C(F)F)c3c2C(F)(F)CCC3(F)F)Cc2cc(F)cc(F)c2)ccc1F
• InChI: InChI=1S/C32H23Cl2F3N2O3.C32H25F8N3O2.C32H26F2N2O3.C31H23F9N4O2.C29H22F6N4O3/c1-17(40)26-11-19(4-5-29(26)37)25-3-2-6-38-32(25)21(7-18-8-22(35)14-23(36)9-18)10-24(41)16-39-30-15-28(34)27(33)12-20(30)13-31(39)42;1-17(44)26-14-19(6-7-27(26)35)24-5-3-9-41-28(24)20(10-18-11-21(33)15-22(34)12-18)13-23(45)16-43-30-25(4-2-8-31(30,36)37)29(42-43)32(38,39)40;1-19(37)31-16-23(8-10-35-31)29-3-2-9-36-32(29)24(11-20-12-25(33)17-26(34)13-20)15-28(39)14-22-5-4-21-6-7-27(38)18-30(21)22;1-15(45)22-10-17(2-3-24(22)34)23-12-41-14-42-26(23)18(6-16-7-19(32)11-20(33)8-16)9-21(46)13-44-28-25(27(43-44)29(35)36)30(37,38)4-5-31(28,39)40;1-15(40)23-11-17(4-5-25(23)32)22-3-2-6-37-26(22)18(7-16-8-19(30)12-20(31)9-16)10-21(41)13-39-14-24(28(36)42)27(38-39)29(33,34)35/h2-6,8-9,11-12,14-15,21H,7,10,13,16H2,1H3;3,5-7,9,11-12,14-15,20H,2,4,8,10,13,16H2,1H3;2-3,5-10,12-13,16-18,24,38H,4,11,14-15H2,1H3;2-3,7-8,10-12,14,18,29H,4-6,9,13H2,1H3;2-6,8-9,11-12,14,18H,7,10,13H2,1H3,(H2,36,42)/t21-;20-;24-;2*18-/m11111/s1
• InChIKey: RMQIIKQLCKKFDQ-UTUYHNLHSA-N
• XLogP: 35.72
• TPSA: 398.02 Ų
• H-Bond Donors: 2
• H-Bond Acceptors: 26
• Rotatable Bonds: 47
• Heavy Atoms: 214
• Complexity: —

Lipinski Rule of Five

3 violations

Rule	Value
MW ≤ 500	3014.61
LogP ≤ 5	35.72
H-Bond Donors ≤ 5	2
H-Bond Acceptors ≤ 10	26

Frequently Asked Questions

What is the IUPAC name of (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one?

The IUPAC name of (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one (CID 160668654) is (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one.

What is the SMILES notation for (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one?

The canonical SMILES for (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one is CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)CC2=CCc3ccc(O)cc32)Cc2cc(F)cc(F)c2)ccn1.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)CN2C(=O)Cc3cc(Cl)c(Cl)cc32)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)Cn2cc(C(N)=O)c(C(F)(F)F)n2)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cccnc2[C@@H](CC(=O)Cn2nc(C(F)(F)F)c3c2C(F)(F)CCC3)Cc2cc(F)cc(F)c2)ccc1F.CC(=O)c1cc(-c2cncnc2[C@@H](CC(=O)Cn2nc(C(F)F)c3c2C(F)(F)CCC3(F)F)Cc2cc(F)cc(F)c2)ccc1F.

What is the InChIKey of (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one?

The InChIKey is RMQIIKQLCKKFDQ-UTUYHNLHSA-N. The full InChI is InChI=1S/C32H23Cl2F3N2O3.C32H25F8N3O2.C32H26F2N2O3.C31H23F9N4O2.C29H22F6N4O3/c1-17(40)26-11-19(4-5-29(26)37)25-3-2-6-38-32(25)21(7-18-8-22(35)14-23(36)9-18)10-24(41)16-39-30-15-28(34)27(33)12-20(30)13-31(39)42;1-17(44)26-14-19(6-7-27(26)35)24-5-3-9-41-28(24)20(10-18-11-21(33)15-22(34)12-18)13-23(45)16-43-30-25(4-2-8-31(30,36)37)29(42-43)32(38,39)40;1-19(37)31-16-23(8-10-35-31)29-3-2-9-36-32(29)24(11-20-12-25(33)17-26(34)13-20)15-28(39)14-22-5-4-21-6-7-27(38)18-30(21)22;1-15(45)22-10-17(2-3-24(22)34)23-12-41-14-42-26(23)18(6-16-7-19(32)11-20(33)8-16)9-21(46)13-44-28-25(27(43-44)29(35)36)30(37,38)4-5-31(28,39)40;1-15(40)23-11-17(4-5-25(23)32)22-3-2-6-37-26(22)18(7-16-8-19(30)12-20(31)9-16)10-21(41)13-39-14-24(28(36)42)27(38-39)29(33,34)35/h2-6,8-9,11-12,14-15,21H,7,10,13,16H2,1H3;3,5-7,9,11-12,14-15,20H,2,4,8,10,13,16H2,1H3;2-3,5-10,12-13,16-18,24,38H,4,11,14-15H2,1H3;2-3,7-8,10-12,14,18,29H,4-6,9,13H2,1H3;2-6,8-9,11-12,14,18H,7,10,13H2,1H3,(H2,36,42)/t21-;20-;24-;2*18-/m11111/s1.

What are the key properties of (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one?

(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one has a molecular weight of 3014.61 g/mol, XLogP of 35.72, 47 rotatable bonds, 2 hydrogen bond donors, and 26 hydrogen bond acceptors.

Where does this data come from?

All data for (4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-[7,7-difluoro-3-(trifluoromethyl)-5,6-dihydro-4H-indazol-1-yl]pentan-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-5,6-dichloro-3H-indol-2-one;1-[(4R)-4-[3-(3-acetyl-4-fluorophenyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-2-oxopentyl]-3-(trifluoromethyl)pyrazole-4-carboxamide;(4R)-4-[5-(3-acetyl-4-fluorophenyl)pyrimidin-4-yl]-1-[3-(difluoromethyl)-4,4,7,7-tetrafluoro-5,6-dihydroindazol-1-yl]-5-(3,5-difluorophenyl)pentan-2-one;(4R)-4-[3-(2-acetyl-4-pyridinyl)-2-pyridinyl]-5-(3,5-difluorophenyl)-1-(6-hydroxy-3H-inden-1-yl)pentan-2-one is sourced from PubChem (CID 160668654), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).