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 benzyl 3-[(5R)-3-(4-bromo-2-fluorophenyl)-4,5-dihydro-1,2-oxazol-5-yl]-2-methyl-2-methylsulfonylpropanoate .
user
C21H21BrFNO5S
assistant