You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R)-2-[[(2R,3R)-2-(1-ethylimidazol-2-yl)oxolane-3-carbonyl]amino]-3-phenylpropanoic acid into molecular formula.
user
C19H23N3O4
assistant