[Br:1][C:2]1[CH:3]=[C:4]([C:9]([O:11]CC)=[O:10])[NH:5][C:6]=1[CH2:7][CH3:8].ClC1C=C(C(O)=O)NC=1C>>[Br:1][C:2]1[CH:3]=[C:4]([C:9]([OH:11])=[O:10])[NH:5][C:6]=1[CH2:7][CH3:8]This intermediate was synthesized from ethyl 4-bromo-5-ethyl-1H-pyrrole-2-carboxylate (Intermediate 11) by an analogous method to Intermediate 8.
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