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 9-[4-[(2R)-1-aminobutan-2-yl]phenyl]-8-methoxy-6-methyl-2,5-dihydro-1H-thieno[2,3-c]quinolin-4-one .
user
C23H26N2O2S
assistant