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ChEBI: Brassicanal A is a member of indoles.

Three main biotransformation products are identified by fungal cultures of the blackleg fungus with brassicanal A. The final transformation product from brassicanal A is via oxidation of the sulfur atom of the methylmercapto group and then hydrogenation of the formyl group to a methyl group to give 3-methylindole- 2-methylsulfoxide which undergoes no further metabolism to afford transformed products.