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 (2S)-2-[(3R)-3-amino-2-methyl-4-oxo-2-(2-pyridin-3-ylsulfonylethylsulfanyl)azetidin-1-yl]-3-[4-(piperazine-1-carbonyloxy)phenyl]propanoic acid .
user
C25H31N5O7S2
assistant