You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-(2,3-dimethylphenyl)-2-[(4-phenyl-5-sulfanylidene-1,3,4-thiadiazol-2-yl)sulfanyl]acetamide into molecular formula.
user
C18H17N3OS3
assistant