3-Pyridinecarboxylic acid, 1-(2,3,6,7-tetrahydro-1,3,7-trimethyl-2,6-dioxo-1H-purin-8-yl)ethyl ester 56021-87-5 8-(alpha-(Nicotinoyloxy)-aethyl)-coffein [German] Ethyl 1-(2,3,6,7-tetrahydro-1,3,7-trimethyl-2,6-dioxo-1H-purin-8-yl)-3-pyridinecarboxylate