You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[1-(ethylamino)-2,3-dihydro-1H-inden-2-yl]sulfanyl]-N,N-dimethyl-1,3,4-thiadiazol-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H20N4S2
assistant