You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (3aS,4S,5S,7aR)-2-[4-(4-hydroxyphenyl)benzoyl]-5-methyl-1,3,3a,4,5,7a-hexahydroisoindole-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H27NO4
assistant