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 identified by (3R,4S)-3-[(4-fluorophenyl)methyl]-4-hydroxy-1-[1-(methoxymethyl)cyclobutanecarbonyl]piperidine-3-carboxylic acid ?
user
C20H26FNO5
assistant