You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-(2,5-dimethylthiophen-3-yl)-N-(2-thiophen-2-ylethyl)-3,6-dihydro-1,3,4-thiadiazin-2-imine by IUPAC nomenclature, provide its molecular formula.
user
C15H17N3S3
assistant