You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3R)-3-(5-chlorothiophen-2-yl)-3-[[(3R)-1-(3-piperidin-4-ylpropanoyl)piperidine-3-carbonyl]amino]propanoic acid .
user
C21H30ClN3O4S
assistant