(2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid

C84H124O41 — CID 102173302

About (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid

(2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid (PubChem CID 102173302) has the molecular formula C84H124O41 and a molecular weight of 1789.87 g/mol. Its IUPAC name is (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid.

Molecular Properties

• Compound Name: (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid
• PubChem CID: 102173302
• Molecular Formula: C84H124O41
• Molecular Weight: 1789.87 g/mol
• Exact Mass: 1788.76
• IUPAC Name: (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid
• SMILES: COc1ccc(/C=C/C(=O)O[C@@H]2[C@H](O)[C@@H](O[C@@H]3O[C@@H](C)[C@H](O[C@@H]4OC[C@@H](O)[C@H](O[C@@H]5OC[C@@H](O)[C@H](O)[C@H]5O)[C@H]4O)[C@@H](O)[C@H]3O)[C@H](OC(=O)[C@]34CCC(C)(C)C[C@H]3C3=CC[C@@H]5[C@@]6(C)CC[C@H](O[C@@H]7O[C@H](C(=O)O)[C@@H](O)[C@H](O[C@@H]8OC[C@H](O)[C@H](O)[C@H]8O)[C@H]7O[C@@H]7O[C@H](CO)[C@H](O[C@@H]8OC[C@@H](O)[C@H](O)[C@H]8O)[C@H](O)[C@H]7O)[C@@](C)(C=O)[C@@H]6CC[C@@]5(C)[C@]3(C)CC4)O[C@@H]2C)cc1
• InChI: InChI=1S/C84H124O41/c1-33-61(118-73-60(104)63(42(90)31-112-73)119-70-53(97)48(92)39(87)28-109-70)51(95)56(100)74(113-33)123-67-58(102)62(117-47(91)17-12-35-10-13-36(108-9)14-11-35)34(2)114-76(67)125-78(107)84-24-22-79(3,4)26-38(84)37-15-16-45-80(5)20-19-46(81(6,32-86)44(80)18-21-83(45,8)82(37,7)23-25-84)116-77-68(65(59(103)66(122-77)69(105)106)121-72-55(99)50(94)41(89)30-111-72)124-75-57(101)52(96)64(43(27-85)115-75)120-71-54(98)49(93)40(88)29-110-71/h10-15,17,32-34,38-46,48-68,70-77,85,87-90,92-104H,16,18-31H2,1-9H3,(H,105,106)/b17-12+/t33-,34+,38-,39+,40+,41-,42+,43+,44+,45+,46-,48-,49-,50-,51-,52+,53+,54+,55+,56+,57+,58-,59-,60+,61-,62-,63-,64-,65-,66-,67+,68+,70-,71-,72-,73-,74-,75-,76-,77+,80-,81-,82+,83+,84-/m0/s1
• InChIKey: CKAQOPRTGOVRSF-OXKYVRSCSA-N
• XLogP: -4.58
• TPSA: 618.79 Ų
• H-Bond Donors: 19
• H-Bond Acceptors: 40
• Rotatable Bonds: 23
• Heavy Atoms: 125
• Complexity: —

Lipinski Rule of Five

3 violations

Rule	Value
MW ≤ 500	1789.87
LogP ≤ 5	-4.58
H-Bond Donors ≤ 5	19
H-Bond Acceptors ≤ 10	40

Computed Properties (RDKit)

• Structural Alerts: {'alert_name': 'aldehyde', 'substructure': 'N/A'}, {'alert_name': 'isolated_alkene', 'substructure': 'N/A'}, {'alert_name': 'Michael_acceptor_1', 'substructure': 'N/A'}, {'alert_name': 'saponine_derivative', 'substructure': 'N/A'}

Frequently Asked Questions

What is the IUPAC name of (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid?

The IUPAC name of (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid (CID 102173302) is (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid.

What is the SMILES notation for (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid?

The canonical SMILES for (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid is COc1ccc(/C=C/C(=O)O[C@@H]2[C@H](O)[C@@H](O[C@@H]3O[C@@H](C)[C@H](O[C@@H]4OC[C@@H](O)[C@H](O[C@@H]5OC[C@@H](O)[C@H](O)[C@H]5O)[C@H]4O)[C@@H](O)[C@H]3O)[C@H](OC(=O)[C@]34CCC(C)(C)C[C@H]3C3=CC[C@@H]5[C@@]6(C)CC[C@H](O[C@@H]7O[C@H](C(=O)O)[C@@H](O)[C@H](O[C@@H]8OC[C@H](O)[C@H](O)[C@H]8O)[C@H]7O[C@@H]7O[C@H](CO)[C@H](O[C@@H]8OC[C@@H](O)[C@H](O)[C@H]8O)[C@H](O)[C@H]7O)[C@@](C)(C=O)[C@@H]6CC[C@@]5(C)[C@]3(C)CC4)O[C@@H]2C)cc1.

What is the InChIKey of (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid?

The InChIKey is CKAQOPRTGOVRSF-OXKYVRSCSA-N. The full InChI is InChI=1S/C84H124O41/c1-33-61(118-73-60(104)63(42(90)31-112-73)119-70-53(97)48(92)39(87)28-109-70)51(95)56(100)74(113-33)123-67-58(102)62(117-47(91)17-12-35-10-13-36(108-9)14-11-35)34(2)114-76(67)125-78(107)84-24-22-79(3,4)26-38(84)37-15-16-45-80(5)20-19-46(81(6,32-86)44(80)18-21-83(45,8)82(37,7)23-25-84)116-77-68(65(59(103)66(122-77)69(105)106)121-72-55(99)50(94)41(89)30-111-72)124-75-57(101)52(96)64(43(27-85)115-75)120-71-54(98)49(93)40(88)29-110-71/h10-15,17,32-34,38-46,48-68,70-77,85,87-90,92-104H,16,18-31H2,1-9H3,(H,105,106)/b17-12+/t33-,34+,38-,39+,40+,41-,42+,43+,44+,45+,46-,48-,49-,50-,51-,52+,53+,54+,55+,56+,57+,58-,59-,60+,61-,62-,63-,64-,65-,66-,67+,68+,70-,71-,72-,73-,74-,75-,76-,77+,80-,81-,82+,83+,84-/m0/s1.

What are the key properties of (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid?

(2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid has a molecular weight of 1789.87 g/mol, XLogP of -4.58, 23 rotatable bonds, 19 hydrogen bond donors, and 40 hydrogen bond acceptors.

Where does this data come from?

All data for (2S,3S,4S,5R,6R)-6-[[(3S,4S,4aR,6aR,6bS,8aS,12aS,14aR,14bR)-8a-[(2S,3R,4S,5R,6R)-3-[(2S,3R,4S,5R,6S)-5-[(2S,3R,4S,5R)-3,5-dihydroxy-4-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3,4-dihydroxy-6-methyloxan-2-yl]oxy-4-hydroxy-5-[(E)-3-(4-methoxyphenyl)prop-2-enoyl]oxy-6-methyloxan-2-yl]oxycarbonyl-4-formyl-4,6a,6b,11,11,14b-hexamethyl-1,2,3,4a,5,6,7,8,9,10,12,12a,14,14a-tetradecahydropicen-3-yl]oxy]-5-[(2S,3R,4R,5R,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-3-hydroxy-4-[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxyoxane-2-carboxylic acid is sourced from PubChem (CID 102173302), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).