2-(Carbonylmethyl)-6-methoxy-1-methylquinolinium iodide dimethyl mercaptal 74020-11-4 Quinolinium, 2-(2,2-bis(methylthio)ethenyl)-6-methoxy-1-methyl-, iodide Quinolinium, 2-(carbonylmethyl)-6-methoxy-1-methyl-, iodide, dimethyl mercaptal