You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(5-propan-2-yl-2,3-dihydro-1H-cyclopenta[b]quinolin-9-yl)-1,3,4-thiadiazol-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H18N4S
assistant