[C:1]([C:12]1[C:20]2[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=2)[N:14]([CH2:21][CH2:22][CH2:23][C:24]([O:26]CC)=[O:25])[CH:13]=1)(=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH3:10].C(C1C2C(=CC=CC=2)N(CCCC(OCC)=O)C=1)(=O)CCCCCC>>[C:1]([C:12]1[C:20]2[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=2)[N:14]([CH2:21][CH2:22][CH2:23][C:24]([OH:26])=[O:25])[CH:13]=1)(=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH3:10]The procedure of Ex. 2 was repeated except that ethyl 4-(3-decanoyl-1-indolyl)butyrate obtained in Ex. 7 was used in place of ethyl 4-(3-heptanoyl-1-indolyl)butyrate to give 4-(3-decanoyl-1-indolyl)butyric acid.
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