Compounds of the formula ##STR1## in which R.sup.1 represents an optionally substituted, straight-chain or branched, saturated, monounsaturated or polyunsaturated alkyl radical, an optionally substituted, saturated or one- or polyunsaturated cycloalkyl radical or an optionally substituted aryl radical or aralkyl radical, X represents CH.sub.2, O, S, NH or N-alkyl with up to 20 C atoms, R.sup.2 has the meaning of R.sup.1, and can represent hydrogen if X denotes CH.sub.2, the radicals R.sup.3 independently of one another represent hydrogen, an acyl radical or alkyl radical with in each case up to 20 C atoms, a silyl radical and/or a phosphoric acid or phosphoric acid ester radical and R.sup.4 denotes hydrogen, methyl or --CH.sub.2 --OR.sup.3, with the proviso that one of the radicals R.sup.3 always represents a phosphoric acid or phosphoric acid ester radical, which stimulate a patient's immune system and are thereby effective in combating viral disease and bacterial infection.
该公式化合物的
化学式为 ##STR1## 其中R.sup.1代表可选择性取代的直链或支链饱和、单不饱和或多不饱和烷基基团、可选择性取代的饱和或单-多不饱和环烷基基团或可选择性取代的芳基基团或芳基烷基基团,X代表CH.sub.2、O、S、NH或N-烷基,烷基含有最多20个碳原子,R.sup.2具有R.sup.1的含义,如果X表示CH.sub.2,则可以表示氢,基团R.sup.3独立地表示氢、酰基基团或烷基基团,每种基团均含有最多20个碳原子、
硅基基团和/或
磷酸或
磷酸酯基团,R.sup.4代表氢、甲基或--CH.sub.2 --OR.sup.3,前提是其中一个基团R.sup.3始终表示
磷酸或
磷酸酯基团,这些化合物可以刺激患者的免疫系统,从而有效地对抗病毒性疾病和细菌感染。