You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-[6-(benzylamino)-2-[4-(2-methoxyethoxy)anilino]purin-9-yl]piperidin-1-yl]prop-2-en-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H33N7O3
assistant