1-{(2R,3R,4R,5R)-3,4-Bis(1,1,2,2-tetramethyl-1-silapropoxy)-5-[(hydroxy{[(4-nitrophenyl)amino]azamethylene}amino)methyl]oxolan-2-yl}-1,3-dihydropyrimidine-2,4-dione AIDS-151699 AIDS151699 NSC693106