You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1,4,5,6,7,8-hexahydrocyclohepta[c]pyrazol-3-yl-[4-(2-methoxyphenyl)piperazin-1-yl]methanone is given. What is its corresponding molecular formula?
user
C20H26N4O2
assistant