4,6(1H,5H)-Pyrimidinedione, 1-[(4',5'-dihydro-5'-oxospiro[9H-fluorene-9,6'(1'H)-[1,2,4]triazin]-3'-yl)amino]dihydro-3-(2-propenyl)-2-thioxo- AIDS-051048 AIDS051048 NSC666173