(+/-)-9-[(1.beta.,2.alpha.,3.beta)-2,3-bis(hydroxymethyl)-1-cyclobutyl]uracil (+/-)-Cyclobut-U 126452-00-4 2,4(1H,3H)-Pyrimidinedione, 1-[2,3-bis(hydroxymethyl)cyclobutyl]-, (1a,2b,3a)-(1)- AIDS-001276 AIDS001276