label: methyl 7-butyl-4,5,6,7-tetrahydro-3-methylamino-4,6-dioxo-5-propyl-2-pyrazolo(3,4-d)pyrimidine-2-carboxylate
label_lc: methyl 7-butyl-4,5,6,7-tetrahydro-3-methylamino-4,6-dioxo-5-propyl-2-pyrazolo(3,4-d)pyrimidine-2-carboxylate