bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene

C190H309N21O3S3 — CID 160610524

IUPACbis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene
SMILESCC(C)C1=CC=CC1.CC(C)C1=CC=CC1.CC(C)C1=CN=CC1.CC(C)c1ccc(C(C)C)[nH]1.CC(C)c1ccc(C(C)C)o1.CC(C)c1ccc(C(C)C)s1.CC(C)c1ccco1.CC(C)c1cccs1.CC(C)c1ccn(C(C)C)c1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)n1cccc1.CCc1cccn1C(C)C.Cc1cc(C)n(C(C)C)c1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)o1.Cc1ccc(C(C)C)s1.Cc1ccn(C(C)C)c1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)n1C.Cc1ncc(C(C)C)n1C
InChIInChI=1S/2C10H17N.C10H16O.C10H16S.2C9H16N2.2C9H15N.2C8H14N2.3C8H13N.C8H12O.C8H12S.2C8H12.2C7H12N2.2C7H11N.C7H10O.C7H10S/c1-8(2)10-5-6-11(7-10)9(3)4;3*1-7(2)9-5-6-10(11-9)8(3)4;2*1-6(2)8-5-10-9(11-8)7(3)4;1-7(2)10-6-8(3)5-9(10)4;1-4-9-6-5-7-10(9)8(2)3;2*1-6(2)8-5-9-7(3)10(8)4;1-7(2)9-5-4-8(3)6-9;4*1-6(2)8-5-4-7(3)9-8;2*1-7(2)8-5-3-4-6-8;2*1-5(2)7-4-8-6(3)9-7;1-6(2)7-3-4-8-5-7;1-7(2)8-5-3-4-6-8;2*1-6(2)7-4-3-5-8-7/h5-9H,1-4H3;5-8,11H,1-4H3;2*5-8H,1-4H3;2*5-7H,1-4H3,(H,10,11);5-7H,1-4H3;5-8H,4H2,1-3H3;2*5-6H,1-4H3;4-7H,1-3H3;2*4-6,9H,1-3H3;2*4-6H,1-3H3;2*3-5,7H,6H2,1-2H3;2*4-5H,1-3H3,(H,8,9);4-6H,3H2,1-2H3;3-7H,1-2H3;2*3-6H,1-2H3
InChIKeyRFLMZSNDSUQRNU-UHFFFAOYSA-N
MW3031.91 g/mol
LogP59.56
Rot. Bonds30

About bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene

bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene (PubChem CID 160610524) has the molecular formula C190H309N21O3S3 and a molecular weight of 3031.91 g/mol. Its IUPAC name is bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene.

Molecular Properties

Compound Namebis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene
PubChem CID160610524
Molecular FormulaC190H309N21O3S3
Molecular Weight3031.91 g/mol
Exact Mass3029.38
IUPAC Namebis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene
SMILESCC(C)C1=CC=CC1.CC(C)C1=CC=CC1.CC(C)C1=CN=CC1.CC(C)c1ccc(C(C)C)[nH]1.CC(C)c1ccc(C(C)C)o1.CC(C)c1ccc(C(C)C)s1.CC(C)c1ccco1.CC(C)c1cccs1.CC(C)c1ccn(C(C)C)c1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)n1cccc1.CCc1cccn1C(C)C.Cc1cc(C)n(C(C)C)c1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)o1.Cc1ccc(C(C)C)s1.Cc1ccn(C(C)C)c1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)n1C.Cc1ncc(C(C)C)n1C
InChIInChI=1S/2C10H17N.C10H16O.C10H16S.2C9H16N2.2C9H15N.2C8H14N2.3C8H13N.C8H12O.C8H12S.2C8H12.2C7H12N2.2C7H11N.C7H10O.C7H10S/c1-8(2)10-5-6-11(7-10)9(3)4;3*1-7(2)9-5-6-10(11-9)8(3)4;2*1-6(2)8-5-10-9(11-8)7(3)4;1-7(2)10-6-8(3)5-9(10)4;1-4-9-6-5-7-10(9)8(2)3;2*1-6(2)8-5-9-7(3)10(8)4;1-7(2)9-5-4-8(3)6-9;4*1-6(2)8-5-4-7(3)9-8;2*1-7(2)8-5-3-4-6-8;2*1-5(2)7-4-8-6(3)9-7;1-6(2)7-3-4-8-5-7;1-7(2)8-5-3-4-6-8;2*1-6(2)7-4-3-5-8-7/h5-9H,1-4H3;5-8,11H,1-4H3;2*5-8H,1-4H3;2*5-7H,1-4H3,(H,10,11);5-7H,1-4H3;5-8H,4H2,1-3H3;2*5-6H,1-4H3;4-7H,1-3H3;2*4-6,9H,1-3H3;2*4-6H,1-3H3;2*3-5,7H,6H2,1-2H3;2*4-5H,1-3H3,(H,8,9);4-6H,3H2,1-2H3;3-7H,1-2H3;2*3-6H,1-2H3
InChIKeyRFLMZSNDSUQRNU-UHFFFAOYSA-N
XLogP59.56
TPSA274.16 Ų
H-Bond Donors7
H-Bond Acceptors20
Rotatable Bonds30
Heavy Atoms217
Complexity—

Lipinski Rule of Five

4 violations

RuleValue
MW ≤ 5003031.91
LogP ≤ 559.56
H-Bond Donors ≤ 57
H-Bond Acceptors ≤ 1020

Analyze bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene with MolForge

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

Launch Full Analysis

Frequently Asked Questions

What is the IUPAC name of bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene?
The IUPAC name of bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene (CID 160610524) is bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene.
What is the SMILES notation for bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene?
The canonical SMILES for bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene is CC(C)C1=CC=CC1.CC(C)C1=CC=CC1.CC(C)C1=CN=CC1.CC(C)c1ccc(C(C)C)[nH]1.CC(C)c1ccc(C(C)C)o1.CC(C)c1ccc(C(C)C)s1.CC(C)c1ccco1.CC(C)c1cccs1.CC(C)c1ccn(C(C)C)c1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)c1cnc(C(C)C)[nH]1.CC(C)n1cccc1.CCc1cccn1C(C)C.Cc1cc(C)n(C(C)C)c1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)[nH]1.Cc1ccc(C(C)C)o1.Cc1ccc(C(C)C)s1.Cc1ccn(C(C)C)c1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)[nH]1.Cc1ncc(C(C)C)n1C.Cc1ncc(C(C)C)n1C.
What is the InChIKey of bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene?
The InChIKey is RFLMZSNDSUQRNU-UHFFFAOYSA-N. The full InChI is InChI=1S/2C10H17N.C10H16O.C10H16S.2C9H16N2.2C9H15N.2C8H14N2.3C8H13N.C8H12O.C8H12S.2C8H12.2C7H12N2.2C7H11N.C7H10O.C7H10S/c1-8(2)10-5-6-11(7-10)9(3)4;3*1-7(2)9-5-6-10(11-9)8(3)4;2*1-6(2)8-5-10-9(11-8)7(3)4;1-7(2)10-6-8(3)5-9(10)4;1-4-9-6-5-7-10(9)8(2)3;2*1-6(2)8-5-9-7(3)10(8)4;1-7(2)9-5-4-8(3)6-9;4*1-6(2)8-5-4-7(3)9-8;2*1-7(2)8-5-3-4-6-8;2*1-5(2)7-4-8-6(3)9-7;1-6(2)7-3-4-8-5-7;1-7(2)8-5-3-4-6-8;2*1-6(2)7-4-3-5-8-7/h5-9H,1-4H3;5-8,11H,1-4H3;2*5-8H,1-4H3;2*5-7H,1-4H3,(H,10,11);5-7H,1-4H3;5-8H,4H2,1-3H3;2*5-6H,1-4H3;4-7H,1-3H3;2*4-6,9H,1-3H3;2*4-6H,1-3H3;2*3-5,7H,6H2,1-2H3;2*4-5H,1-3H3,(H,8,9);4-6H,3H2,1-2H3;3-7H,1-2H3;2*3-6H,1-2H3.
What are the key properties of bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene?
bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene has a molecular weight of 3031.91 g/mol, XLogP of 59.56, 30 rotatable bonds, 7 hydrogen bond donors, and 20 hydrogen bond acceptors.
Where does this data come from?
All data for bis(1,2-dimethyl-5-propan-2-ylimidazole);2,4-dimethyl-1-propan-2-ylpyrrole;2,5-di(propan-2-yl)furan;bis(2,5-di(propan-2-yl)-1H-imidazole);1,3-di(propan-2-yl)pyrrole;2,5-di(propan-2-yl)-1H-pyrrole;2,5-di(propan-2-yl)thiophene;2-ethyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylfuran;bis(2-methyl-5-propan-2-yl-1H-imidazole);bis(2-methyl-5-propan-2-yl-1H-pyrrole);3-methyl-1-propan-2-ylpyrrole;2-methyl-5-propan-2-ylthiophene;bis(1-propan-2-ylcyclopenta-1,3-diene);2-propan-2-ylfuran;1-propan-2-ylpyrrole;4-propan-2-yl-3H-pyrrole;2-propan-2-ylthiophene is sourced from PubChem (CID 160610524), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).