A compound of formula (II): ##STR1## wherein R is a C.sub.1-4 alkyl group; R.sub.1 is a hydrogen atom or a C.sub.1-4 alkyl group; R.sub.2 is a hydrogen or halogen atom, or a C.sub.1-4 alkyl, C.sub.1-4 alkoxy or C.sub.1-4 alkylthio group; and pro-drugs thereof; and the pharmaceutically acceptable salts of the compounds of formula (II) and of their pro-drugs; has useful anti-inflammatory and analgesic activity.
式(II)的化合物:##STR1## 其中R为C.sub.1-4烷基;R.sub.1为氢原子或C.sub.1-4烷基;R.sub.2为氢原子或卤素原子,或C.sub.1-4烷基,C.sub.1-4烷氧基或C.sub.1-4烷
硫基基团;以及其前药,化合物(II)及其前药的药学上可接受的盐具有有用的抗炎和镇痛活性。