93857-77-3 EINECS 299-212-6 Hydrogen 6-methyl-2-(2-methyl-3-(6-methyl-3-(4-sulphonatobutyl)-3H-benzothiazol-2-ylidene)prop-1-enyl)-3-(4-sulphonatobutyl)benzothiazolium, compound with pyridine (1:1)