You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[5-(3,4-dimethylphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-(2-methyl-5-nitrophenyl)acetamide into molecular formula.
user
C19H18N4O4S
assistant