Certain new 1-(3',5'-O-Variable-.beta.-D-arabinofuranosyl)-N.sup.4 -.alpha.-aminoacylcytosines, for example, 1-(5'-O-palmitoyl-.beta.-D-arabinofuranosyl)-N.sup.4 -[N.sup..alpha.-[N-(tert-butoxycarbonyl)glycyl]-L-arginyl]cytosine hydrochloride, have been found active against neoplastic cells, viruses, and as immunosuppressants. The 3'-O-, or 5'-O-, variability includes the hydrogen atom and acyl groups. The N.sup.4 -.alpha.-aminoacyl group comprises .alpha.-amino acids, N-protected .alpha.-amino acids, and similar peptidyl sequences of .alpha.-amino acids. Acid addition salts are an embodiment of the invention.
某些新的1-(3',5'-O-可变-.beta.-D-阿拉伯
呋喃糖基)-N.sup.4-.alpha.-
氨基酰基
胞嘧啶,例如1-(5'-O-棕榈酰基-.beta.-D-阿拉伯
呋喃糖基)-N.sup.4-[N.sup..alpha.-[N-(叔丁氧羰基)甘
氨酰基]-L-精
氨酰基]
胞嘧啶盐酸盐,已被发现对肿瘤细胞、病毒和
免疫抑制剂具有活性。3'-O-或5'-O-可变性包括氢原子和酰基。N.sup.4-.alpha.-
氨基酰基包括
α-氨基酸、N-保护的
α-氨基酸和类似的
α-氨基酸肽序列。酸加成盐是本发明的一种实施形式。