You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[[4-(2,3-dihydro-1,4-benzodioxine-6-carbonyl)piperidin-1-yl]methyl]-6-azabicyclo[3.2.0]heptan-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26N2O4
assistant