You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(5-butyl-1,3,4-thiadiazol-2-yl)-1-(2,5-dimethylphenyl)-5-oxopyrrolidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N4O2S
assistant