You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[5-fluoro-2-[[(2S)-oxolan-2-yl]methoxy]phenyl]-3-[(3R)-1-hydroxy-4-methylpentan-3-yl]urea .
user
C18H27FN2O4
assistant