4,4'-(3,7,12,16-Tetramethyl-1,3,5,7,9,11,13,15,17,-octadecanonaen-1,18-diyl)bis(1-ethylpyridium) dibromide 97931-76-5 Pyridinium, 4,4'-(3,7,12,16-tetramethyl-1,3,5,7,9,11,13,15,17-octadecanonaene-1,18-diyl)bis(1-ethyl-, dibromide, (all-E)- Y 18598 Y-18598