You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-(3-methylquinoxalin-2-yl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H15N5O2S
assistant