7-[3-[[2-Hydroxy-2-(4-hydroxy-3,5-dimethylphenyl)ethyl]amino]butyl]-1,3-dimethyl-1H-purine-2,6(3H,7H)-dione;7-[3-[[2-Hydroxy-2-(4-hydroxy-3,5-xylyl)ethyl]amino]butyl]theophyline
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