| 摘要 |
<p>1. 5-(2-hydroxy-3-thiopropoxy)chromone-2-carboxylic acids characterized by the general formula see diagramm : EP0017578,P11,F1 wherein R its an alkyl group of from 1 to 16 carbon atoms, an alkenyl group of 3 to 4 carbon atoms, a cycloalkyl group of from 3 to 8 carbon atoms or a cycloalkylalkyl group of from 4 to 9 carbon atoms ; and alkali and alkaline-earth metal salts thereof and alkyl esters thereof having 1 to 4 carbon atoms.</p> |
