1,2,5, {7-Tetraazaspiro[2.5]octa-1,7-diene-4,6-dione} 1,2,5,7-Tetraazaspiro[2.5]octa-1,7-diene-4,6-dione AIDS-129907 AIDS129907 NSC371717 {1,2,5,7-Tetraazaspiro[2.5]octa-1,4-diene-6,8-dione}