Methylketol or 2-methylindole is a mildly toxic and slightly flammable organic compound which occurs as a white solid which turns brown over time. It has chemical formula . Methylketol is used as an intermediate for synthesizing dyes, pigments, optical brighteners, and pharmaceuticals. See also Indole Methyl 1-Methylindole 5-Methylindole 7-Methylindole Skatole (3-methylindole) References Methylindoles Foul-smelling chemicals