using a novel spectrophotometric assay to detect free radical scavengers , the effects of sulfasalazine , a compound frequently administered in the treatment of chronic inflammatory bowel disease , and its main metabolites , 5-aminosalicylic acid ( 5-asa ) , sulfapyridine , and n-acetyl-5-asa , were compared with biological antioxidants ( nordihydroguaiaretic acid ( ndga ) , alpha-tocopherol , and ascorbic acid ) and antiinflammatory salicylates ( acetylsalicylic acid and sodium salicylate ) .
C0036077
salicylates
C0004057
acetylsalicylic acid