You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2,3-dimethylquinoxalin-6-yl)-[(3R,4R)-3-methoxy-4-[(3-methyl-1,2-oxazol-5-yl)methyl]pyrrolidin-1-yl]methanone into molecular formula.
user
C21H24N4O3
assistant