suppress carrageenin-induced edema in rats and ultravioletinduced erythema in guinea pigs. Similarly, these compounds were without effect at 50 mg/kg per day against adjuvantinduced arthritis in rats. Aspirin is accepted as active in these assays at the indicated doses with a 99% frequency, and the thiazolylacetic acid 1 is active at these screening levels. Compound 2a was ineffective in the carrageenin edema and uv ...