| 摘要 |
NEW MATERIAL:The chloic acid derivative of formula I or formula II [N-(7- ketolithocholyl)-N-carboxymethylglycine]. USE:A lithotriptic agent applicable even to a cholesteric cholelith having calcified crust. PREPARATION:For example, the deoxycholic acid of formula III or 7-ketolithocholic acid of formula IV or their reactive derivative is made to react with iminodiacetic acid.
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