[NH2:1][C:2]1[CH:10]=[CH:9][C:8]([C:11]([C:13]2[N:21]3[C:16]([CH:17]=[CH:18][CH:19]=[CH:20]3)=[C:15]([Br:22])[C:14]=2[CH3:23])=[O:12])=[CH:7][C:3]=1[C:4](O)=[O:5].[NH2:24][CH2:25][C:26]([OH:28])=[O:27]>>[NH2:1][C:2]1[CH:10]=[CH:9][C:8]([C:11]([C:13]2[N:21]3[C:16]([CH:17]=[CH:18][CH:19]=[CH:20]3)=[C:15]([Br:22])[C:14]=2[CH3:23])=[O:12])=[CH:7][C:3]=1[C:4]([NH:24][CH2:25][C:26]([O:28][C:3]([CH3:7])([CH3:4])[CH3:2])=[O:27])=[O:5]Obtained according to the process described in Step 1.5, using 2-amino-5-[(1-bromo-2-methylindolizin-3-yl)carbonyl]benzoic acid and the tert-butyl ester of glycine, in the form of a yellow powder (74%).
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