4-Methoxy-7,8-dihydro-6-thia-2,9a-diaza-benzo[cd]azulen-9-one 9-methoxy-2,4,5,6-tetrahydro-imidazo[3,4,5-e.f]-1,5-benzothiazepin-5-one AIDS-085855 AIDS085855 NSC674926