You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[4-(3-chloro-4-methylphenyl)-1,2,4-triazol-3-yl]sulfanyl]-1-(2,3-dihydroindol-1-yl)propan-1-one into molecular formula.
user
C20H19ClN4OS
assistant