(Theophyllinyl-7' ethyloxy)-2 oxo-2 dioxaphosphorinanne-1,3,2 [French] 69387-74-2 BRN 1173561 Phosphoric acid, 2-(1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxopurin-7-yl) ethyl cyclic trimethylene ester