Cl.[CH3:2][N:3]([CH2:5][CH2:6][O:7][C:8]([CH:10]1[CH2:22][CH2:21][C:20]2[C:19]3[C:14](=[CH:15][CH:16]=[C:17]([Cl:23])[CH:18]=3)[NH:13][C:12]=2[CH2:11]1)=[O:9])[CH3:4].C(O)C>CCOCC>[ClH:23].[CH3:4][N:3]([CH2:5][CH2:6][O:7][C:8]([CH:10]1[CH2:22][CH2:21][C:20]2[C:19]3[C:14](=[CH:15][CH:16]=[C:17]([Cl:23])[CH:18]=3)[NH:13][C:12]=2[CH2:11]1)=[O:9])[CH3:2]A slight excess of 7.5N alcoholic hydrogen chloride was added to a solution of 2.7 g. of 6-chloro-1,2,3,4-tetrahydrocarbazole-2-carboxylic acid dimethylaminoethyl ester in 15 ml. of ethanol. Ether was added until crystallization was induced and the resulting precipitate was filtered and washed with a mixture of ethanol and ether. Upon drying, 2.8 g. of the salt, 6-chloro-1,2,3,4-tetrahydrocarbazole-2-carboxylic acid dimethylaminoethyl ester hydrochloride, m.p. 201°-203° , was obtained.
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