You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(cyclopentylamino)-1-oxopropan-2-yl] (E)-3-(7-chloro-1,3-benzodioxol-5-yl)prop-2-enoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H20ClNO5
assistant