You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S,3S)-3-methyl-2-[[2-[(1R)-3-oxo-2-[(Z)-pent-2-enyl]cyclopentyl]acetyl]amino]pentanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H28NO4-
assistant