You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6R,11bS)-7-acetyl-2-methyl-3-methylsulfanyl-6-(2,3,4-trimethoxyphenyl)-6,11b-dihydro-[1,2,4]triazino[1,6-c]quinazolin-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26N4O5S
assistant