... 5-[ acetyl(2,3-dihydroxypropyl)amino ]-~ ,~-bis(23-dihydroxypropy1 )-2 4,6-trioo-1,3benzenedicarboxamide dimethyl 5-nitro- 3-amino- 1, 2- 5-nitro-N,N'-bis(2, 3- isophtholate propanediol dihydroxypropy1 )- (from ... ommonia) 5-amino-N,N8-bis(2. 3- 5-amino-2.4.6-triiodo- dihydroxyprapy1)isophthalamide N,N'-bis(2,3-dihydroxy- (I) propy1)isophthalamide NaOCH, H O / \ ~ C I OH 5-acetamido-2.4.6-triiodoN.Na-bis(2.3-dihydroxypropyl)isophtholamide ... (S)-N,~-bis[2-hydroxy- 1-( hydroxymethyl)ethyl ]-5 -[ (2-hydroxy-1-oxopropyl)amino ]-2 ,4,6-triiodo-l benzenedicarboxamide COOH II C Hz"4 chloride I 5-ornino-2.4. 6- 5-orninoiso- triiodoiso- phtholic ocid...