22279-14-7 4H-1,3,4-Thiadiazine, 5,6-dihydro-2-(4-pyridyl)-4,6,6-trimethyl-, hydrochloride 5,6-Dihydro-2-(4-pyridyl)-4,6,6-trimethyl-4H-1,3,4-thiadiazine hydrochloride