C[O:2][C:3](=[O:17])[CH2:4][C:5]1[CH:10]=[CH:9][C:8]([CH2:11][NH:12][S:13]([CH3:16])(=[O:15])=[O:14])=[CH:7][CH:6]=1.COC(=O)CC1C=CC=CC=1CNC(OC(C)(C)C)=O>>[CH3:16][S:13]([NH:12][CH2:11][C:8]1[CH:9]=[CH:10][C:5]([CH2:4][C:3]([OH:17])=[O:2])=[CH:6][CH:7]=1)(=[O:15])=[O:14]Compound 12a was prepared by following the procedure of Example 1, Step e, except 11a was substituted for 5a. (54%) Mass Spectral Analysis m/z=242.2 (M−H)− tR=1.47 min (96%)
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