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