«Inhibition of xanthine oxidase by phytic acid and its antioxidative action.» (nutritionfacts.org)
In fact, caffeine, theophylline, and theobromine all belong to the same class of xanthine alkaloids producing a strikingly similar effect. (mypetneedsthat.com)
While a single chocolate chip will not adversely harm a dog, pet owners should be concerned about methyl xanthine in dark and Baker's chocolate, and xylitol in sugar - free baked goods, and candy. (chicagovma.org)