2H-1,3-Thiazine-2,4(3H)-dione, dihydro-3-methyl-2-thio- 3-Methyl-2-thioxo-1,3-thiazinan-4-one 4H-1,3-Thiazin-4-one, tetrahydro-3-methyl-2-thioxo- 7629-41-6 AIDS-127946 AIDS127946 NSC202965