You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-chloro-5-ethoxy-4-phenylmethoxyphenyl)-2-(2,3-dihydroindole-1-carbonyl)prop-2-enenitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H23ClN2O3
assistant