38336-82-2 5,5-Dimethyl-4,4-dioxido-2-phenyl-5,6-dihydro-1,4,3-oxathiazin-6-yl ethyl ether 6-Ethoxy-5,5-dimethyl-2-phenyl-5,6-dihydro-1,4,3-oxathiazine 4,4-dioxide AIDS-127661 AIDS127661 NSC174548