6-(2-aminoethyl)-1,3-dimethyl-5-phenyl-1,6-dihydropyrrolo[3,4-d]pyrimidine-2,4-dione

[2-(1,3-dimethyl-2,4-dioxo-5-phenyl-1,2,3,4-tetrahydro-pyrrolo[3,4-d]pyrimidin-6-yl)-ethyl]carbamic acid tert-butyl ester