TRICYCLIC COMPOUNDS, THEIR PREPARATION AND USE

摘要

Compounds of formula (II): …… wherein… R is a C1-4alkyl group;… R1 is a hydrogen atom or a C1-4alkyl group;… R2 is a hydrogen or halogen atom, or a C1-4alkyl, C1-4alkyl, C1-4alkoxy or C1-4alkylthio group; and the dotted line represents an optionally present double bond;… and pro-drugs thereof; and the pharmaceutically acceptable salts of the compounds of formula (II) and of their pro-drugs; they have useful anti-inflammatory and analgesic activity; processes for the preparation of the novel compounds; novel starting compounds for these processes and novel intermediates for the preparation of starting compounds.