You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name [(2S)-1-(2,2-dimethyl-3-oxo-4H-quinoxalin-1-yl)-1-oxopropan-2-yl] 2-hydroxy-4-methylbenzoate ?
user
C21H22N2O5
assistant