Nonionic compounds of the formula ##STR1## wherein X is --CONR.sub.1 R.sub.2, --COOR.sub.3, --CH.sub.2 NHR.sub.7 or --CH.sub.2 OH; Y is --1R.sub.1 R.sub.2 or --OR.sub.3 ; and Z is --NR.sub.1 R.sub.2, --NHR.sub.7 or --OR.sub.3 ; and wherein R.sub.1 R.sub.2 and R.sub.3 in X, Y or Z, and R.sub.7 in X and Z, are identical or different, R.sub.1 and R.sub.2, and each is hydrogen, C.sub.1-6 -alkyl or C.sub.2-8 - alkyl substituted by 1-5 OH groups and/or by a C.sub.1-3 -alkoxy group; R.sub.3 is C.sub.1-4 -alkyl or C.sub.2-4 -alkyl substituted by 1-2 OH groups and/or by a C.sub.1-3 -alkoxy group; and R.sub.7 is an acyl group of a C.sub.2-5 OH group and/or by a C.sub.1-3 -alkoxy group are highly advantageous X-ray contrast agents.
化学式为 ##STR1## 的非离子化合物,其中X为--CONR.sub.1 R.sub.2,--COOR.sub.3,--CH.sub.2 NHR.sub.7或--CH.sub.2 OH; Y为--1R.sub.1 R.sub.2或--OR.sub.3; Z为--NR.sub.1 R.sub.2,--NHR.sub.7或--OR.sub.3; 其中X,Y或Z中的R.sub.1 R.sub.2和R.sub.3,以及X和Z中的R.sub.7,可以相同也可以不同,R.sub.1和R.sub.2各自为氢,C.sub.1-6-烷基或C.sub.2-8-烷基,该烷基可被1-5个OH基团和/或C.sub.1-3-烷氧基取代; R.sub.3为C.sub.1-4-烷基或C.sub.2-4-烷基,该烷基可被1-2个OH基团和/或C.sub.1-3-烷氧基取代; R.sub.7为C.sub.2-5-OH基团的酰基和/或C.sub.1-3-烷氧基,具有极高的X射线对比剂优势。