You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[4-(2-cyclopentylacetyl)piperazin-1-yl]-4-methyl-1-oxopentan-2-yl]-3a,4,7,7a-tetrahydroisoindole-1,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H37N3O4
assistant