Pivaloyl chloride → (2S,4S)-2-[trans-2,5-Dimethyl-4-(4-nitrobenzyloxycarbonyl)piperazin-1-ylcarbonyl]-4-mercapto-1-(4-nitrobenzyloxycarbonyl)pyrrolidine

Reaction equation

COC1C=CC(C[S:8][C@@H:9]2[CH2:13][N:12]([C:14]([O:16][CH2:17][C:18]3[CH:23]=[CH:22][C:21]([N+:24]([O-:26])=[O:25])=[CH:20][CH:19]=3)=[O:15])[C@H:11]([C:27]([OH:29])=O)[CH2:10]2)=CC=1.C(Cl)(=O)C(C)(C)C.[CH3:39][C@H:40]1[CH2:45][NH:44][C@H:43]([CH3:46])[CH2:42][N:41]1[C:47]([O:49][CH2:50][C:51]1[CH:56]=[CH:55][C:54]([N+:57]([O-:59])=[O:58])=[CH:53][CH:52]=1)=[O:48]>C(N(CC)CC)C>[CH3:46][C@H:43]1[CH2:42][N:41]([C:47]([O:49][CH2:50][C:51]2[CH:56]=[CH:55][C:54]([N+:57]([O-:59])=[O:58])=[CH:53][CH:52]=2)=[O:48])[C@H:40]([CH3:39])[CH2:45][N:44]1[C:27]([C@@H:11]1[CH2:10][C@H:9]([SH:8])[CH2:13][N:12]1[C:14]([O:16][CH2:17][C:18]1[CH:19]=[CH:20][C:21]([N+:24]([O-:26])=[O:25])=[CH:22][CH:23]=1)=[O:15])=[O:29]