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4-methyl-1H-indole-3-carboxylic acid; CAS No.: 858515-65-8; Specializing in Small molecules synthesis, we supply methylindole acids for melatonin receptor targeting. The 4-methyl-3-carboxylic acid group enhances receptor subtype selectivity. Our Fischer indole synthesis achieves >95% yield. This intermediate enables development of circadian rhythm regulators with improved pharmacokinetics.