Rhone Poulenc Rorer

Michael Thomas Withnall

Bernard Yvon Vacher

Michael John Ashton

Sven Jan-Anders Karlsson

Compounds of formula I ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, n, and are as defined herein, their use as antiinflammatory, immunosuppressive, and antiallergic agents, pharmaceutical compositions comprising them, and methods for their preparation comprising irradiating compounds of formula II ##STR2## under an inert atmosphere, in the presence or absence of a compound of formula R.sub.3 --S--S(O).sub.m --R.sub.8, where R.sub.7, R.sub.8, and m are as defined herein, and methods for their preparation comprising oxidizing, reducing, halogenating, or alkylating compounds of formula I are disclosed.

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Dagenham, United Kingdom

Michael Thomas Withnall