3-Carbazolecarboxylicacid, 5,6,7,8-tetrahydro- (5CI); 1,2,3,4-Tetrahydro-6-carboxycarbazole;2,3,4,9-tetrahydro-1H-carbazole-6-carboxylic acid;6,7,8,9-Tetrahydro-5H-carbazole-3-carboxylic acid
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