You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-(2,4-dichlorophenyl)-2-imidazol-1-ylethyl] (2S,3R)-2-ethenyloxolane-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H18Cl2N2O3
assistant