You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-fluorophenyl)-N-[(3R,4S)-4-(1,3-thiazol-4-ylmethoxy)oxan-3-yl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H21FN2O3S
assistant