Pharmacologic properties of some derivatives of N-(2-carboxyphenyl)-4-phenoxyacetamide.

Three new inhibitors of prostaglandin (PG) synthetase: N-(2-carboxy-4-chlorophenyl)-phenoxyacetamide (ZR 29), N-(2-carobxy-4-chlorophenyl/-bromophenoxyacetamide (ZR-32), N-(2-carboxy-4-chlorophenyl)-4' - nitrophenoxyacetamide (ZR-35), in doses of 30-100-200 mg/kg p.o. inhibited edema in an acute inflammatory model, ZR-32 inhibited formation of granuloma. In the chronic inflammatory model, ZR-32 exerted strongest activity in the second and third weeks. ZR-32 demonstrated strong analgesic activity in the test of stimulation with electric current and in the "hot plate" test, besides antipyretic activity. Both compounds weekly irritated the gastric mucosa. In the tests applied, these compounds had no effect on the CNS. Their acute to toxicity was substantially lower than that of acetylsalicyclic aid and indomethacin.