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2-Hydroxyquinoline-4-carboxylic acid84906-81-042 % similar Indoxyl480-93-342 % similar Indole-4-carboxylic acid2124-55-241 % similar Indole-3-lactic acid1821-52-941 % similar D-Tryptophan153-94-640 % similar (±)-Tryptophan54-12-640 % similar Tryptophan73-22-340 % similar 4-Hydroxyquinoline-3-carboxylic acid ethyl ester26892-90-040 % similar Indole-3-acetone1201-26-940 % similar Indoxyl acetate608-08-240 % similar Indole-3-acetamide879-37-840 % similar 5-Bromo-1H-indole-3-carboxylic acid10406-06-139 % similar 3-(5-Azaindole)carboxylic acid119248-43-039 % similar 1H-Pyrrolo(2,3-c)pyridine-3-carboxylic acid67058-74-639 % similar 1H-Pyrrolo(3,2-b)pyridine-3-carboxylic acid860496-20-439 % similar Rg10848208-26-038 % similar Indole-3-carbaldehyde487-89-838 % similar Indole-3-carbinol700-06-138 % similar Alpha-methyl-L-tryptophan16709-25-438 % similar N-Methyl-L-tryptophan526-31-838 % similar