Ammonium Hydroxide → 5-methylseleno-3'-t-butyldimethylsilyl-5'-O-(4,4-dimethoxytrityl)-2'-deoxycytidine

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[CH3:1][Se:2][C:3]1[C:4](=O)[NH:5][C:6](=[O:47])[N:7]([CH:46]=1)[C@@H:8]1[O:38][C@H:12]([CH2:13][O:14][C:15]([C:32]2[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=2)([C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C:16]2[CH:21]=[CH:20][C:19]([O:24][CH3:25])([O:22][CH3:23])[CH2:18][CH:17]=2)[C@@:10]([Si:39]([C:42]([CH3:45])([CH3:44])[CH3:43])([CH3:41])[CH3:40])([OH:11])[CH2:9]1.C([N:52](C(C)C)CC)(C)C.C(C1C=CC(S(Cl)(=O)=O)=C(C(C)C)C=1C(C)C)(C)C.[OH-].[NH4+]>C(#N)C.CN(C)C1C=CN=CC=1.C(Cl)Cl.CO.C(OCC)(=O)C.CCCCCC>[CH3:1][Se:2][C:3]1[C:4]([NH2:52])=[N:5][C:6](=[O:47])[N:7]([CH:46]=1)[C@@H:8]1[O:38][C@H:12]([CH2:13][O:14][C:15]([C:26]2[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=2)([C:32]2[CH:33]=[CH:34][CH:35]=[CH:36][CH:37]=2)[C:16]2[CH:21]=[CH:20][C:19]([O:22][CH3:23])([O:24][CH3:25])[CH2:18][CH:17]=2)[C@@:10]([Si:39]([C:42]([CH3:43])([CH3:45])[CH3:44])([CH3:40])[CH3:41])([OH:11])[CH2:9]1