4-Chloro-1-isopropoxy-3,5-dimethyl-1-oxido-1,2,3,6-tetrahydro-3-phosphininyl methyl ether 4-Chloro-1-isopropoxy-3-methoxy-3,5-dimethyl-1,2,3,6-tetrahydrophosphinine 1-oxide AIDS-142781 AIDS142781 NSC660836