You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (4R)-1-(3,4-dimethylphenyl)-4-(3-ethyl-1,2,4-oxadiazol-5-yl)pyrrolidin-2-one is given. What is its corresponding molecular formula?
user
C16H19N3O2
assistant