3-(Butoxycarbonyl)-1-methylpyridinium methyl sulphate 68867-59-4 99450-80-3 Butyl N-methylnicotinium methosulfate EINECS 272-520-8 Pyridinium, 1-methyl-3-(butoxycarbonyl)-, methosulfate Pyridinium, 3-(butoxycarbonyl)-1-methyl-, methyl sulfate