You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-[4-amino-3-[2-(3,5-dimethoxyphenyl)ethynyl]pyrazolo[3,4-d]pyrimidin-1-yl]azetidin-1-yl]but-2-yne-1,4-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22N6O4
assistant