You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[1-(5-chloro-1H-indole-2-carbonyl)piperidin-4-yl]-N-[(2-ethoxyphenyl)methyl]propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H30ClN3O3
assistant