105522-62-1 1H-Purine-2,6-dione, 3,7-dihydro-7-(2-hydroxy-2-(4-nitrophenyl)ethyl)-3-methyl-8-(1-piperazinyl)-, monohydrochloride 7-(beta-Hydroxy-p-nitrophenethyl)-8-(1-piperazinyl)-3-methylxanthine monohydrochloride