You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (3R,3aS,4aS,8aS,9aR)-8a-methyl-5-methylidene-3-[(4-phenylpiperazin-1-yl)methyl]-3a,4,4a,6,7,8,9,9a-octahydro-3H-benzo[f][1]benzofuran-2-one ?
user
C25H34N2O2
assistant