Similar to theophylline, some 7,8-substituted theophyllines may retain bronchodilatory properties, making them potential candidates for the treatment of respiratory diseases.
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1,3-Dimethyl-8-piperidin-1-yl-7-{2-[piperidin-(2Z)-ylideneamino]-ethyl}-3,7-dihydro-purine-2,6-dione
2-ethyl-4-(3-pyridyl)-1(2H)-phthalazinone
