You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-[1-[7-fluoro-4-[5-(methylaminomethyl)-2-oxo-1,3-oxazolidin-3-yl]cyclohepta-1,3,6-trien-1-yl]piperidin-4-ylidene]butanenitrile ?
user
C21H27FN4O2
assistant