You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(Z)-N-(2-tert-butyl-4,6-dihydrothieno[3,4-c]pyrazol-3-yl)-3-(4-nitrophenyl)prop-2-enamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H20N4O3S
assistant