Muramyldipeptide derivatives represented by the formula: ##STR1## wherein Ala represents alanine; Acyl represents an acyl group; R.sub.1 and R.sub.2 each represents a hydrogen atom or, when taken together, may form an alkylidene group; R.sub.3 represents a hydrogen atom, an acyl group or an alkyl group; and R.sub.4 represents a hydrogen atom or an alkyl group. These compounds have excellent immunoadjuvant activity, prophylactic and therapeutic effects against microbial infections, and antitumor activity.
公式为:##STR1## 的Muramyldipeptide衍
生物,其中Ala代表丙
氨酸;Acyl代表酰基;R.sub.1和R.sub.2分别代表氢原子或当它们在一起时,可以形成烷基亚基;R.sub.3代表氢原子、酰基或烷基;R.sub.4代表氢原子或烷基。这些化合物具有出色的免疫佐剂活性,预防和治疗微
生物感染的作用,以及抗肿瘤活性。