You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-tert-butyl-6-[2-[4-(hydroxymethyl)phenyl]ethylamino]-5H-pyrazolo[3,4-d]pyrimidin-4-one is given. What is its corresponding molecular formula?
user
C18H23N5O2
assistant