You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R,5R)-3-[[2,6-dichloro-4-(4-fluorophenyl)phenyl]methyl]-5-ethyloxolan-2-one;(3R,5S)-3-[[2,6-dichloro-4-(4-fluorophenyl)phenyl]methyl]-5-(hydroxymethyl)oxolan-2-one;(5R)-5-ethyloxolan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C43H42Cl4F2O7
assistant