You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 4-[[(3aR)-1,2,3,3a,4,5,6,6a-octahydrocyclopenta[c]pyrrol-5-yl]oxymethyl]-5-cyclopropyl-3-(2,6-dichlorophenyl)-1,2-oxazole into molecular formula.
user
C20H22Cl2N2O2
assistant