You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-(1,3-benzodioxol-5-yl)-2-(3,4-dihydro-2H-1,5-benzodioxepin-7-ylamino)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20N2O5
assistant