Compounds of the formula ##STR1## where X.sub.1 and X.sub.2 are independently O or S, and R.sub.1 is as defined in the description R.sub.2, R.sub.3, and R.sub.4 are each independently straight or branched chain (C.sub.1-4)alkyl, and pharmaceutically acceptable salts, physiological hydrolysable esters, and pro-drug forms thereof are useful as hypoglycemic agents.
式为##STR1##的化合物,其中X.sub.1和X.sub.2分别为O或S,R.sub.1如描述中所定义,R.sub.2、R.sub.3和R.sub.4各自独立地为直链或支链(C.sub.1-4)烷基,以及其药学上可接受的盐、生理可
水解酯和前药形式可用作降血糖药物。