You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6S)-3-butylsulfanyl-6-(3,4,5-trimethoxyphenyl)-6,7-dihydro-[1,2,4]triazino[5,6-d][3,1]benzoxazepine is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H26N4O4S
assistant