You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R,3R,6S)-2-[2-(benzylamino)ethyl]-3,6-dimethyl-5-methylidene-4-oxooxane-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H25NO4
assistant