1-(Theophyllinyl-7-methyenecarboxyloxy)-2-(nicotinoyl)ethane 61379-43-9 7H-Purine-7-acetic acid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-, 2-((3-pyridinylcarbonyl)oxy)ethyl ester