2-(3-tert-Butyl-5,5-dimethyl-2-oxido-1,3,2-oxazaphospholidin-2-yl)-1-butenyl methyl ether 3-tert-Butyl-2-(1-ethyl-2-methoxyvinyl)-5,5-dimethyl-1,3,2-oxazaphospholidine 2-oxide AIDS-153334 AIDS153334 NSC699812