CC(C)CCC1NC2C(C=1)=CC=CC=2.[C:15]([C:18]1[CH:19]=[C:20]2[C:24](=[CH:25][CH:26]=1)[NH:23][C:22]([CH2:27][CH2:28][C:29]([CH3:31])=[CH2:30])=[CH:21]2)([OH:17])=[O:16]>>[C:15]([C:18]1[CH:19]=[C:20]2[C:24](=[CH:25][CH:26]=1)[NH:23][C:22]([CH2:27][CH2:28][CH:29]([CH3:31])[CH3:30])=[CH:21]2)([OH:17])=[O:16]Refer to 28b) using 5-carboxy-2-(2-methyl-1-buten-4-yl) indole as the starting material.
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