2-Methyl-5-phenyl-3-(3-sulphonatobutyl)benzoxazolium 51981-34-1 Benzoxazolium, 2-methyl-5-phenyl-3-(3-sulfobutyl)-, hydroxide, inner salt Benzoxazolium, 2-methyl-5-phenyl-3-(3-sulfobutyl)-, inner salt EINECS 257-575-8