You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R,13R)-4-methoxy-1,13-dimethyl-10-azatricyclo[7.3.1.02,7]trideca-2(7),3,5-trien-10-yl]-(3-methylfuran-2-yl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25NO3
assistant