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 2-[(1R,8S,9R)-4,5-difluoro-11-oxatricyclo[6.2.1.02,7]undeca-2,4,6-trien-9-yl]ethynyl-tri(propan-2-yl)silane .
user
C21H28F2OSi
assistant