86497-77-0 AIDS-130059 AIDS130059 Ethyl 2,8-diethyl-1,3,7,9-tetraoxooctahydro-1H-pyrrolo[3,4-d]pyrrolo[3',4':4,5]isoxazolo[2,3-b]isoxazole-9b(6aH)-carboxylate NSC376728