1H-Purine-2,6-dione, 3,7-dihydro-8-(4-(2-hydroxyethyl)-1-piperazinyl)-1,3-dimethyl- 40171-75-3 BRN 1161605 N(sup 1)-(8-Teofillina)-N(sup 4)-beta-idrossietilpiperazina [Italian] N(sup 1)-(Theophyllinyl-8)-N(sup 4)-beta-hydroxyethylpiperazine