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 (4S)-4-[5-chloro-2-(difluoromethoxy)phenyl]-N-(4-chlorophenyl)-2-methyl-1,4-dihydropyrimido[1,2-a]benzimidazole-3-carboxamide .
user
C25H18Cl2F2N4O2
assistant