You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2,3-dihydro-1,4-benzodioxin-3-ylmethyl)-3-[1-(3-ethoxyphenyl)ethyl]-1-ethylurea is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N2O4
assistant