3-Carboxy-1-methylpyridinium chloride 535-83-1 6138-41-6 EINECS 228-119-5 N-Methyl-3-carboxypyridinium chloride N-Methylnicotinic acid chloride NSC 66510 Pyridinium, 3-carboxy-1-methyl-, chloride (8CI)(9CI) TRIGONELLINE Trigonelline hydrochloride