Abstract: Compounds of the general formula ##STR1## wherein R represents a group selected from: ##STR2## AND ##STR3## where: N = 0,1;X = OH, OCH.sub.3, OC.sub.2 H.sub.5 ;y = h, ch.sub.3 ;r.sub.1, r.sub.2, that may be the same or different = H, CH.sub.3, C.sub.2 .sub.5, C.sub.3 H.sub.7 ; and their water soluble pharmaceutically acceptable salts.The compounds are prepared by introducing the acidic moiety upon the heterocyclic nuclei which can be prepared according to known procedure.The present invention relates to novel antiinflammatory agents and specifically to certain novel heterocyclo alkanoic acids. More particularly it relates to heterocyclo-acetic and to 2-(heterocyclo)propionic acids in which the heterocyclo moiety of the molecule is an oxygen containing nucleus.