You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-(6-hydroxy-4-oxo-3-propan-2-ylcyclohexene-1-carbonyl)-1,3,4,5-tetrahydroisoindole-5-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H25NO5
assistant