Novel compounds of the formula ##STR1## wherein Q, R.sup.1 and R.sup.2 are described herein, are disclosed along with pharmaceutical compositions, methods of use, and process for producing compounds of formula I which starts from the corresponding .beta.-hydroxycarboxylic acids.
                            公开了化合物的新型式,其
化学式为##STR1##其中Q,R.sup.1和R.sup.2如本文所述,同时公开了制备这些化合物的制药组合物、使用方法和从相应的β-羟基
羧酸开始制备式I化合物的过程。