2(or 4)-Isopropyl-4(or 2),6-dimethyldihydro-4H-1,3,5-dithiazine Dihydro-2(or 6)-isopropyl-4,6(or 2)-dimethyl-4H-1,3,5-dithiazine Dihydro-4,6(or 2)-dimethyl-2(or 6)-(1-methylethyl)-4H-1,3,5-dithiazine Dimethylisopropyldihydro-1,3,5-dithiazine