113139-67-6 2(1H)-Pyrazinone, 5,6-dimethyl-3-(1-methylethyl)-, monohydrochloride 2-Hydroxy-3-isopropyl-5,6-dimethylpyrazine hydrochloride 5,6-Dimethyl-3-(1-methylethyl)-2(1H)-pyrazinone monohydrochloride