2-(Carbonylmethyl)-1-methylquinolinium iodide dimethyl mercaptal 2-Bis(2-methylthio)vinyl-1-methylquinolinium 21804-67-1 Quinolinium, 2-(2,2-bis(methylthio)ethenyl)-1-methyl, iodide Quinolinium, 2-(carbonylmethyl)-1-methyl-, iodide, dimethyl mercaptal