You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[9-[(1S,3R,4S)-1-ethyl-7-phenylmethoxyspiro[2,5-dioxabicyclo[2.2.1]heptane-6,1'-cyclopropane]-3-yl]-6-oxo-1H-purin-2-yl]-2-methylpropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H29N5O5
assistant