You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (6R)-2-[(4-chlorophenyl)methylsulfanyl]-6-(3,4,5-trimethoxyphenyl)-6,7-dihydro-5H-[1,2,4]triazolo[5,1-b]quinazolin-8-one by IUPAC nomenclature, provide its molecular formula.
user
C25H23ClN4O4S
assistant