You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2S)-N-methyl-3-oxo-2-[2-oxo-2-(4-phenylpiperazin-1-yl)ethyl]piperazine-1-carbothioamide ?
user
C18H25N5O2S
assistant