NOVEL INDANE DERIVATIVES,PROCESS FOR THEIR PREPARATION,THEIR USE AS PHARMACEUTICALS AND PHARMACEUTICAL COMPOSITIONS CONTAINING SAID DERIVATIVES

摘要

The invention provides compounds of formula wherein R1 and R2 are alkyl, R3 is hydrogen, alkyl, alkenyl, phenylalkyl or a group -(CH2-CH2-O)n-R4 in which n is 1 to 3 and R4 is hydrogen or an acid residue, and the ring A is unsubstituted or substituted, with the proviso that when R3 is methyl the ring A is substituted. The compounds are useful in the treatment and prophylaxis of allergic conditions.