| 摘要 |
<p>The acids of formula (I), in which E is COOH, two of the groups R5 to R8 form a chain -COCH=CE-O- and the ethers can be various radicals, for use in treatment of reversible obstruction of the respiratory tract and to prevent excessive mucus secretion, are made by selective oxidn. or hydrolysis of a cpd. of formula (II) in which D is an oxidisable or hydrolysable gp., or by suitable treatment of other starting cpds..</p> |
