Sodium hydride → 1alpha,3beta-bis(tert-butyldimethylsilyloxy)-20-{4-ethyl-4-triethylsilyloxy-(2E)-hexenyloxy}-20-methylpregna-5,7,16-triene

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[Si:1]([O:8][C@@H:9]1[C@@:29]2([CH3:30])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:28]2[CH2:27][CH2:26][C@@:25]2([CH3:31])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C:21]([OH:24])([CH3:23])[CH3:22])[CH2:12][C@@H:11]([O:32][Si:33]([C:36]([CH3:39])([CH3:38])[CH3:37])([CH3:35])[CH3:34])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].Br/[CH:41]=[CH:42]/[CH2:43][C:44]([CH2:55][CH3:56])([O:47][Si:48]([CH2:53][CH3:54])([CH2:51][CH3:52])[CH2:49][CH3:50])[CH2:45][CH3:46].[H-].[Na+].C1OCCOCCOCCOCCOC1>O1CCCC1>[Si:1]([O:8][C@@H:9]1[C@@:29]2([CH3:30])[C:13](=[CH:14][CH:15]=[C:16]3[C@@H:28]2[CH2:27][CH2:26][C@@:25]2([CH3:31])[C@H:17]3[CH2:18][CH:19]=[C:20]2[C:21]([O:24]/[CH:41]=[CH:42]/[CH2:43][C:44]([CH2:55][CH3:56])([O:47][Si:48]([CH2:53][CH3:54])([CH2:49][CH3:50])[CH2:51][CH3:52])[CH2:45][CH3:46])([CH3:23])[CH3:22])[CH2:12][C@@H:11]([O:32][Si:33]([C:36]([CH3:39])([CH3:38])[CH3:37])([CH3:34])[CH3:35])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]