6-Methylnicotinaldehyde6-Methylpyridine-3-carboxaldehyde5-Formyl-2-methylpyridine2-Methyl-5-formylpyridine5-Formyl-2-picoline3-甲酰基-6-甲基吡啶3-Formyl-6-methylpyridine6-Methylnicotinaldehyde6-甲基-3-吡啶醛5-甲酰基-2-甲基吡啶6-甲基吡啶-3-甲醛6-Methylpyridine-3-carboxaldehyde