(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide

C60H93N21O12 — CID 59074717

IUPAC(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide
SMILESCCC(C)[C@H](NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](C)CCCN=C(N)N)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCN=C(N)N)C(=O)N[C@@H](CCCN=C(N)N)C(C)=O
InChIInChI=1S/C60H93N21O12/c1-5-32(2)49(81-53(89)42(22-24-47(62)84)75-50(86)33(3)14-11-25-70-58(64)65)57(93)80-44(29-36-31-73-39-18-10-9-17-37(36)39)55(91)78-43(28-35-15-7-6-8-16-35)54(90)77-41(21-23-46(61)83)52(88)79-45(30-48(63)85)56(92)76-40(20-13-27-72-60(68)69)51(87)74-38(34(4)82)19-12-26-71-59(66)67/h6-10,15-18,31-33,38,40-45,49,73H,5,11-14,19-30H2,1-4H3,(H2,61,83)(H2,62,84)(H2,63,85)(H,74,87)(H,75,86)(H,76,92)(H,77,90)(H,78,91)(H,79,88)(H,80,93)(H,81,89)(H4,64,65,70)(H4,66,67,71)(H4,68,69,72)/t32?,33-,38-,40-,41-,42-,43-,44-,45-,49-/m0/s1
InChIKeyBUSUOBTVDCXOAN-AZDFGGHOSA-N
MW1300.54 g/mol
LogP-4.33
Rot. Bonds43

About (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide

(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide (PubChem CID 59074717) has the molecular formula C60H93N21O12 and a molecular weight of 1300.54 g/mol. Its IUPAC name is (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide.

Molecular Properties

Compound Name(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide
PubChem CID59074717
Molecular FormulaC60H93N21O12
Molecular Weight1300.54 g/mol
Exact Mass1299.73
IUPAC Name(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide
SMILESCCC(C)[C@H](NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](C)CCCN=C(N)N)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCN=C(N)N)C(=O)N[C@@H](CCCN=C(N)N)C(C)=O
InChIInChI=1S/C60H93N21O12/c1-5-32(2)49(81-53(89)42(22-24-47(62)84)75-50(86)33(3)14-11-25-70-58(64)65)57(93)80-44(29-36-31-73-39-18-10-9-17-37(36)39)55(91)78-43(28-35-15-7-6-8-16-35)54(90)77-41(21-23-46(61)83)52(88)79-45(30-48(63)85)56(92)76-40(20-13-27-72-60(68)69)51(87)74-38(34(4)82)19-12-26-71-59(66)67/h6-10,15-18,31-33,38,40-45,49,73H,5,11-14,19-30H2,1-4H3,(H2,61,83)(H2,62,84)(H2,63,85)(H,74,87)(H,75,86)(H,76,92)(H,77,90)(H,78,91)(H,79,88)(H,80,93)(H,81,89)(H4,64,65,70)(H4,66,67,71)(H4,68,69,72)/t32?,33-,38-,40-,41-,42-,43-,44-,45-,49-/m0/s1
InChIKeyBUSUOBTVDCXOAN-AZDFGGHOSA-N
XLogP-4.33
TPSA588.13 Ų
H-Bond Donors18
H-Bond Acceptors15
Rotatable Bonds43
Heavy Atoms93
Complexity—

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5001300.54
LogP ≤ 5-4.33
H-Bond Donors ≤ 518
H-Bond Acceptors ≤ 1015

Computed Properties (RDKit)

Structural Alerts{'alert_name': 'Aliphatic_long_chain', 'substructure': 'N/A'}, {'alert_name': 'imine_1', 'substructure': 'N/A'}, {'alert_name': 'imine_2', 'substructure': 'N/A'}

Analyze (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide with MolForge

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Launch Full Analysis

Related Compounds

(2S)-2-[[(2S)-2-[[(2S,3S)-2-[[(2S)-2-[[(2S,3S)-2-[[(2S)-2-[[(2S)-5-amino-2-[[(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-5-oxopentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid
CID 25081247
(2S,3S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-4-amino-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-3-carboxypropanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-4-methylpentanoyl]amino]-4-oxobutanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-4-methylpentanoyl]amino]-3-phenylpropanoyl]amino]-3-phenylpropanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-methylpentanoic acid
CID 25090791
(2S)-5-(diaminomethylideneamino)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S,3S)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S,3S)-2-[[(2S)-5-(diaminomethylideneamino)-2-[[(2S)-3-(1H-indol-3-yl)-2-[[(2S)-2-(octanoylamino)-3-phenylpropanoyl]amino]propanoyl]amino]pentanoyl]amino]-3-methylpentanoyl]amino]pentanoyl]amino]-3-methylpentanoyl]amino]pentanoyl]amino]pentanoic acid
CID 122222701
2-[[4-amino-2-[[2-[[2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-methylpentanoyl]amino]-4-oxobutanoyl]amino]-3-(1H-indol-3-yl)propanoic acid
CID 18244149
2-[[2-[[2-[[2-amino-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-3-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid
CID 19947406
(2R,3R)-2-[[(2R)-2-[[(2S)-2-[[(2S)-2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-N-[(2R)-1-[[(2R)-1-amino-3-hydroxy-1-oxopropan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]-3-methylpentanamide
CID 73356352
2-[[2-[[5-(diaminomethylideneamino)-2-[(2,4-diamino-4-oxobutanoyl)amino]pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-methylpentanoic acid
CID 22652824
(2R,3R)-2-[[(2R)-2-[[(2S)-2-[[(2S)-2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-N-[(2R)-1-[(2-amino-2-oxoethyl)amino]-1-oxo-3-phenylpropan-2-yl]-3-methylpentanamide
CID 73345724
(2S)-2-[[(2S,3S)-2-[[(2S)-2-[[(2S)-4-amino-2-[[(2S)-5-amino-2-[[(2S)-2-[[(2S)-2-[[(2S)-2,6-diaminohexanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-5-oxopentanoyl]amino]-4-oxobutanoyl]amino]-4-methylsulfanylbutanoyl]amino]-3-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoic acid
CID 175951118
(2R)-N-[(2R)-1-[[(2R)-1-[[(2R)-1-[[(2R,3R)-1-[[(2R)-1-[[(2R)-1-[[(2R)-1-[[(2R)-1-[[(2R,3R)-1-[[(2R)-1-amino-5-(diaminomethylideneamino)-1-oxopentan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-5-(diaminomethylideneamino)-1-oxopentan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-5-(diaminomethylideneamino)-1-oxopentan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-1-oxopropan-2-yl]amino]-5-(diaminomethylideneamino)-1-oxopentan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]-2-[[(2R)-2-amino-3-methylbutanoyl]amino]pentanediamide
CID 169494506
(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3S)-2-amino-3-methylpentanoyl]amino]-5-(diaminomethylideneamino)pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-3-phenylpropanoyl]amino]pentanedioic acid
CID 10284485
(2R,3R)-2-[[(2R)-2-[[(2S)-2-[[(2S)-2-amino-5-(diaminomethylideneamino)pentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-N-[(2R)-1-[[(2R)-1-amino-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]-3-methylpentanamide
CID 73350309

Frequently Asked Questions

What is the IUPAC name of (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide?
The IUPAC name of (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide (CID 59074717) is (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide.
What is the SMILES notation for (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide?
The canonical SMILES for (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide is CCC(C)[C@H](NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](C)CCCN=C(N)N)C(=O)N[C@@H](Cc1c[nH]c2ccccc12)C(=O)N[C@@H](Cc1ccccc1)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCCN=C(N)N)C(=O)N[C@@H](CCCN=C(N)N)C(C)=O.
What is the InChIKey of (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide?
The InChIKey is BUSUOBTVDCXOAN-AZDFGGHOSA-N. The full InChI is InChI=1S/C60H93N21O12/c1-5-32(2)49(81-53(89)42(22-24-47(62)84)75-50(86)33(3)14-11-25-70-58(64)65)57(93)80-44(29-36-31-73-39-18-10-9-17-37(36)39)55(91)78-43(28-35-15-7-6-8-16-35)54(90)77-41(21-23-46(61)83)52(88)79-45(30-48(63)85)56(92)76-40(20-13-27-72-60(68)69)51(87)74-38(34(4)82)19-12-26-71-59(66)67/h6-10,15-18,31-33,38,40-45,49,73H,5,11-14,19-30H2,1-4H3,(H2,61,83)(H2,62,84)(H2,63,85)(H,74,87)(H,75,86)(H,76,92)(H,77,90)(H,78,91)(H,79,88)(H,80,93)(H,81,89)(H4,64,65,70)(H4,66,67,71)(H4,68,69,72)/t32?,33-,38-,40-,41-,42-,43-,44-,45-,49-/m0/s1.
What are the key properties of (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide?
(2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide has a molecular weight of 1300.54 g/mol, XLogP of -4.33, 43 rotatable bonds, 18 hydrogen bond donors, and 15 hydrogen bond acceptors.
Where does this data come from?
All data for (2S)-N-[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-4-amino-1-[[(2S)-5-(diaminomethylideneamino)-1-[[(3S)-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxopentan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]-2-[[(2S)-5-(diaminomethylideneamino)-2-methylpentanoyl]amino]pentanediamide is sourced from PubChem (CID 59074717), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).