116680-95-6 2-Methyl-2H-isothiazol-3-one hydrochloride 2-Methyl-3-isothiazolone hydrochloride 2-Methyl-4-isothiazolin-3-one hydrochloride 26172-54-3 2682-20-4 3(2H)-Isothiazolone, 2-methyl-, hydrochloride EINECS 247-499-3