71236-79-8 AIDS-129202 AIDS129202 Dimethyl 8,8-dimethyl-2,5,5-triphenyl-5,8-dihydro-2H,3H-8.lambda.~5~-[1,2]azaphospholo[2,1-b][1,3,2]oxazaphosphole-6,7-dicarboxylate NSC336382