| 摘要 |
New nonionic radiographic contrast agents having the formula <IMAGE> wherein Y is a single bond, <IMAGE> <IMAGE> <IMAGE> R1, R1' and R2 are the same or different and are hydrogen, alkyl or hydroxyalkyl. Hydroxyalkyl refers to such alkyl groups having 1 or more hydroxy groups. Preferred hydroxyalkyl groups include: <IMAGE> <IMAGE> R3 and R4 are the same or different and are hydrogen, methyl or -CH2CH2OH; R5 is hydrogen, alkyl, -CH2CH2OH, CH2OH or OH and R6 is alkyl, -CH2CH2OH, CH2OH, OH or hydrogen and may be the same or different than R5 and m is zero or one, with the proviso that no methylene or methine carbon atom of the heterocyclic ring is attached to both a nitrogen and an oxygen atom with the additional proviso that when Y is a single bond, m is not zero. These new contrast agents are water soluble and have desirable low osmolality and anticoagulant properties.
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