1-Ethyl-4-carbomethoxypyridinium iodide 1199-65-1 N-Ethyl-4-carbomethoxypyridinium iodide NSC 41724 NSC 53229 Pyridinium, 1-ethyl-4-(methoxycarbonyl)-, iodide Pyridinium, 4-carboxy-1-ethyl-, iodide, methyl ester