2(1H)-Pyrimidinone, 4-amino-1-(3,5-anhydro-2-deoxy-.beta.-D-threo-pentofuranosyl)- 3',5'-Epoxy-2'-dC B-D-threo 3',5'-Epoxy-2'-deoxycytidine B-D-threo 7481-87-0 AIDS-000930 AIDS000930