3794436 EPTMAC 2,3-epoxypropyl trimethyl ammonium chloride 10 1900877 EPTAC 2,3-epoxypropyltrimethylammonium chloride 6 1971732 ETMAC 2,3-epoxypropyltrimethylammonium chloride 5 3850048 EP3MAC 2,3-epoxypropyltrimethylammonium chloride 2