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 [(3R)-7'-bromo-8'-hydroxy-6-methoxy-5'-methoxyimino-1-oxospiro[2-benzofuran-3,6'-7,8-dihydrobenzo[f][1,3]benzodioxole]-5-yl] acetate .
user
C22H18BrNO9
assistant