| 摘要 |
<p><CHEM> wherein R<1> is organic residue having molecular weight of from 15 to 700, R<2> is hydrogen or hydroxyl, R<3> is hydrogen, acyl, optionally substituted phosphono or sulfo, and R<3> and hydroxyl of R<2> may form acetal residue or ketal residue, and a salt thereof are provided. The compound (I) and salts thereof have excellent prophylactic and improving actions on disorders of circulatory functions, and they are useful as agents of prophylaxis and improvement of circulatory functional disorders.</p> |
