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 1-[1-[(3S)-1,1-dioxothiolan-3-yl]-2,5-dimethylpyrrol-3-yl]-2-[(5-phenyl-1H-imidazol-2-yl)sulfanyl]ethanone .
user
C21H23N3O3S2
assistant