You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1-butan-2-yl-6-methylpyrazolo[3,4-b]pyridin-4-yl)-[2-(2-hydroxyethyl)piperidin-1-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C19H28N4O2
assistant