Compound of formula ##STR1## wherein n is 0 or 1, R.sub.1 and R.sub.2 are independently methyl, ethyl or cyclopropyl and R is an optionally substituted phenyl or heteroaryl group or salt or ester thereof are useful in the treatment of inflammatory bowel disease.
Compounds of formula
wherein n is 0 or 1, R₁ and R₂ are independently methyl, ethyl or cyclopropyl and R is an optionally substituted phenyl or heteroaryl group or salt or ester thereof are useful in the treatment of inflammatory bowel disease.