You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-chloro-2,5-difluorophenyl)-3-sulfanylidene-6,7,8,8a-tetrahydro-5H-imidazo[1,5-a]pyridin-1-one .
user
C13H11ClF2N2OS
assistant