About (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid
(2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid (PubChem CID 91855733) has the molecular formula C83H141N4O70P
and a molecular weight of 2345.97 g/mol. Its IUPAC name is (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid.
Frequently Asked Questions
What is the IUPAC name of (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid?
The IUPAC name of (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid (CID 91855733) is (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid.
What is the SMILES notation for (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid?
The canonical SMILES for (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid is N[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO[C@@H]2O[C@H](CO[C@]3(C(=O)O)C[C@@H](O[C@]4(C(=O)O)C[C@@H](O[C@H]5O[C@H](COP(=O)(O)O[C@H]6OC[C@H](N)[C@H](O)[C@H]6O)[C@@H](O)[C@H](O)[C@H]5N)[C@@H](O)[C@@H](C(O)CO)O4)[C@@H](O[C@H]4O[C@H](CO)[C@@H](O[C@H]5O[C@H](CO[C@H]6O[C@H](CO)[C@@H](O)[C@H](O)[C@@H]6O[C@H]6O[C@H](CO)[C@@H](O)[C@H](O)[C@H]6O)[C@@H](O)[C@H](O[C@]6(C(=O)O)C[C@@H](O)[C@@H](O)[C@@H]([C@H](O)CO)O6)[C@@H]5O[C@H]5O[C@H](CO)[C@H](O)[C@H](O[C@H]6O[C@H](CO)[C@@H](O)[C@H](O)[C@H]6O)[C@H]5O)[C@H](O)[C@@H]4O)[C@@H]([C@H](O)CO)O3)[C@@H](O)[C@H](O)[C@H]2N)O[C@@H]1O.
What is the InChIKey of (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid?
The InChIKey is HSRKJUYMJLNWHC-BPVMQSKSSA-N. The full InChI is InChI=1S/C83H141N4O70P/c84-17-12-132-71(54(118)36(17)100)157-158(130,131)136-16-32-43(107)49(113)35(87)70(145-32)138-22-2-83(80(128)129,154-60(44(22)108)20(98)5-89)152-23-3-81(78(124)125,135-15-31-42(106)48(112)34(86)69(144-31)133-13-29-41(105)47(111)33(85)68(123)137-29)155-61(21(99)6-90)63(23)148-74-57(121)53(117)62(28(11-95)143-74)147-77-67(151-75-58(122)64(45(109)27(10-94)141-75)149-72-55(119)50(114)38(102)24(7-91)139-72)65(156-82(79(126)127)1-18(96)37(101)59(153-82)19(97)4-88)46(110)30(146-77)14-134-76-66(52(116)40(104)26(9-93)142-76)150-73-56(120)51(115)39(103)25(8-92)140-73/h17-77,88-123H,1-16,84-87H2,(H,124,125)(H,126,127)(H,128,129)(H,130,131)/t17-,18+,19+,20?,21+,22+,23+,24+,25+,26+,27+,28+,29+,30+,31+,32+,33+,34+,35+,36-,37+,38+,39+,40+,41+,42+,43+,44+,45-,46+,47+,48+,49+,50-,51-,52-,53+,54+,55+,56+,57-,58+,59+,60+,61+,62+,63+,64-,65-,66-,67-,68-,69+,70-,71+,72+,73+,74+,75+,76-,77+,81+,82-,83+/m0/s1.
What are the key properties of (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid?
(2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid has a molecular weight of 2345.97 g/mol, XLogP of -29.17, 44 rotatable bonds, 44 hydrogen bond donors, and 70 hydrogen bond acceptors.
Where does this data come from?
All data for (2S,4R,5R,6R)-2-[(2R,3S,4S,5R,6R)-2-[(2R,3S,4R,5S,6R)-6-[(2R,3R,4R,6R)-4-[(2R,4R,5R,6R)-4-[(2S,3R,4R,5S,6R)-3-amino-6-[[[(2R,3R,4S,5S)-5-amino-3,4-dihydroxyoxan-2-yl]oxy-hydroxyphosphoryl]oxymethyl]-4,5-dihydroxyoxan-2-yl]oxy-2-carboxy-6-[(1R)-1,2-dihydroxyethyl]-5-hydroxyoxan-2-yl]oxy-6-[[(2R,3S,4R,5R,6R)-5-amino-6-[[(2R,3S,4R,5R,6S)-5-amino-3,4,6-trihydroxyoxan-2-yl]methoxy]-3,4-dihydroxyoxan-2-yl]methoxy]-6-carboxy-2-[(1R)-1,2-dihydroxyethyl]oxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-3-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-6-[[(2S,3S,4S,5S,6R)-4,5-dihydroxy-6-(hydroxymethyl)-3-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxymethyl]-5-hydroxyoxan-4-yl]oxy-6-[(1R)-1,2-dihydroxyethyl]-4,5-dihydroxyoxane-2-carboxylic acid is sourced from PubChem (CID 91855733), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).