Synonyms: 4-Carboxy-1-ethylpyridiniumiodide, methyl ester (6CI,7CI); Pyridinium, 1-ethyl-4-(methoxycarbonyl)-, iodide(9CI); Pyridinium, 4-carboxy-1-ethyl-, iodide, methyl ester (8CI);1-Ethyl-4-(methoxycarbonyl)pyridinium iodide; 1-Ethyl-4-carbomethoxypyridiniumiodide; N-Ethyl-4-carbomethoxypyridinium iodide