116680-96-7 26172-55-4 26530-03-0 3(2H)-Isothiazolone, 5-chloro-2-methyl-, hydrochloride 5-Chloro-2-methyl-2H-isothiazol-3-one hydrochloride 5-Chloro-2-methyl-4-isothiazolin-3-one hydrochloride EINECS 247-760-1