Sodium triacetoxyborohydride → tert-butyl (5S,12S)-12-[(R)-[(3R,4R,5R)-3,4-bis{[tert-butyl(dimethyl)silyl]oxy}-5-(3-(4-methoxybenzyl)-2,4-dioxo-3,4-dihydro-1(2H)-pyrimidinyl)tetrahydro-2-furanyl](hydroxy)methyl]-5-[3-(tert-butoxy)-3-oxopropyl]-3,6-dioxo-1-phenyl-2-oxa-4,7,11-triazatridecan-13-oate

Reaction equation

[NH2:1][C@@H:2]([C@H:10]([C@@H:12]1[C@@H:16]([O:17][Si:18]([C:21]([CH3:24])([CH3:23])[CH3:22])([CH3:20])[CH3:19])[C@@H:15]([O:25][Si:26]([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:28])[CH3:27])[C@H:14]([N:33]2[CH:38]=[CH:37][C:36](=[O:39])[N:35]([CH2:40][C:41]3[CH:46]=[CH:45][C:44]([O:47][CH3:48])=[CH:43][CH:42]=3)[C:34]2=[O:49])[O:13]1)[OH:11])[C:3]([O:5][C:6]([CH3:9])([CH3:8])[CH3:7])=[O:4].[CH2:50]([O:57][C:58]([NH:60][C@H:61]([C:71](=[O:77])[NH:72][CH2:73][CH2:74][CH:75]=O)[CH2:62][CH2:63][C:64]([O:66][C:67]([CH3:70])([CH3:69])[CH3:68])=[O:65])=[O:59])[C:51]1[CH:56]=[CH:55][CH:54]=[CH:53][CH:52]=1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>C(O)(=O)C.O1CCCC1>[Si:18]([O:17][C@H:16]1[C@@H:15]([O:25][Si:26]([C:29]([CH3:32])([CH3:31])[CH3:30])([CH3:27])[CH3:28])[C@H:14]([N:33]2[CH:38]=[CH:37][C:36](=[O:39])[N:35]([CH2:40][C:41]3[CH:46]=[CH:45][C:44]([O:47][CH3:48])=[CH:43][CH:42]=3)[C:34]2=[O:49])[O:13][CH:12]1[C@H:10]([OH:11])[C@@H:2]([C:3]([O:5][C:6]([CH3:7])([CH3:9])[CH3:8])=[O:4])[NH:1][CH2:75][CH2:74][CH2:73][NH:72][C:71](=[O:77])[C@H:61]([CH2:62][CH2:63][C:64]([O:66][C:67]([CH3:70])([CH3:69])[CH3:68])=[O:65])[NH:60][C:58](=[O:59])[O:57][CH2:50][C:51]1[CH:52]=[CH:53][CH:54]=[CH:55][CH:56]=1)([C:21]([CH3:22])([CH3:23])[CH3:24])([CH3:20])[CH3:19]