2H-1,2,6-Thiadiazine, 3,4-dihydro-3,3,5-trimethyl-, 1,1-dioxide 3,4-Dihydro-3,3,5-trimethyl-2H-1,2,6-thiadiazole 1,1-dioxide 73908-90-4 BRN 1073673 NSC 103998 NSC 664276