Sodium hydride → 1alpha,3beta-Bis(tert-butyldimethylsilyloxy)-17-(4-triethylsilyloxy-4-methyl-2-pentynyloxymethyl)androsta-5,7,16-triene

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[Si:1]([O:8][C@@H:9]1[C@@:26]2([CH3:27])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:25]2[CH2:24][CH2:23][C@@:21]2([CH3:22])[C@H:17]3[CH2:18][CH:19]=[C:20]2[CH2:28][OH:29])[CH2:12][C@@H:11]([O:30][Si:31]([C:34]([CH3:37])([CH3:36])[CH3:35])([CH3:33])[CH3:32])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].Br[CH2:39][C:40]#[C:41][C:42]([O:45][Si:46]([CH2:51][CH3:52])([CH2:49][CH3:50])[CH2:47][CH3:48])([CH3:44])[CH3:43].[H-].[Na+].C1OCCOCCOCCOCCOC1>O1CCCC1>[Si:1]([O:8][C@@H:9]1[C@@:26]2([CH3:27])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:25]2[CH2:24][CH2:23][C@@:21]2([CH3:22])[C@H:17]3[CH2:18][CH:19]=[C:20]2[CH2:28][O:29][CH2:39][C:40]#[C:41][C:42]([O:45][Si:46]([CH2:47][CH3:48])([CH2:49][CH3:50])[CH2:51][CH3:52])([CH3:43])[CH3:44])[CH2:12][C@@H:11]([O:30][Si:31]([C:34]([CH3:37])([CH3:36])[CH3:35])([CH3:32])[CH3:33])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]