4-Methyl-7-oxo-2,6-diphenyl-5,6-diazaspiro[2.4]hept-4-ene-1,1-dicarbonitrile AIDS-135092 AIDS135092 NSC634353 {5,6-Diazaspiro[2,4]hept-4-ene-1,1-dicarbonitrile,} 4-methyl-7-oxo-2,6-diphenyl, trans-(+/-)-