You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[4-(1,3-benzodioxol-5-ylmethyl)piperazin-1-yl]methyl]-5,8a-dimethyl-3,3a,7,8,9,9a-hexahydrobenzo[f][1]benzofuran-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H34N2O4
assistant