Acetic Acid → 20-(5,5-Dimethyl-1,3-dioxan-2-yl)-3beta-(tert-butyldimethylsilyl)oxy-1alpha-(methoxymethyl)oxy-7alpha-(methoxycarbonyl)oxypregn-5-ene

Reaction equation

[CH3:1][C:2]1([CH3:42])[CH2:7][O:6][CH:5]([CH:8]([C@@H:10]2[C@:27]3([CH3:28])[C@H:13]([C@H:14]4[C@H:24]([CH2:25][CH2:26]3)[C@:22]3([CH3:23])[C@:17](O)([CH2:18][C@@H:19]([O:33][Si:34]([C:37]([CH3:40])([CH3:39])[CH3:38])([CH3:36])[CH3:35])[CH2:20][C@@H:21]3[O:29][CH2:30][O:31][CH3:32])[CH:16]=[CH:15]4)[CH2:12][CH2:11]2)[CH3:9])[O:4][CH2:3]1.C(O)(=O)C.[C:47](=[O:52])([O:50]C)[O:48][CH3:49]>>[CH3:42][C:2]1([CH3:1])[CH2:7][O:6][CH:5]([CH:8]([C@@H:10]2[C@:27]3([CH3:28])[C@H:13]([C@H:14]4[C@H:24]([CH2:25][CH2:26]3)[C@:22]3([CH3:23])[C:17]([CH2:18][C@@H:19]([O:33][Si:34]([C:37]([CH3:38])([CH3:39])[CH3:40])([CH3:35])[CH3:36])[CH2:20][C@@H:21]3[O:29][CH2:30][O:31][CH3:32])=[CH:16][C@H:15]4[O:52][C:47]([O:48][CH3:49])=[O:50])[CH2:12][CH2:11]2)[CH3:9])[O:4][CH2:3]1