8-benzyltheophylline3,7-dihydro-1,3-dimethyl-8-(phenylmethyl)-1h-purine-6-dione8-benzyl-theophyllin8-benzyl-3,7-dihydro-1,3-dimethyl-1h-purine-2,6-dione8-benzyltheophylline wet (30-40% loss on drying)8-benzyltheophylline dried1,3-dimethyl-8-benzylxanthine8-benzyltheophyline