7-[2-(4-Benzyl-1-piperazinyl)ethyl]-3,7-dihydro-1,3-dimethyl-1H-purine-2,6-dione;7-[2-(4-Benzyl-1-piperazinyl)ethyl]theophyline;7-[2-(4-Benzyl-1-piperazinyl)ethyl]theophylline
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