You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(6,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)-3-oxopropyl]-3-[[6-(2,2,2-trifluoroethoxy)pyridin-3-yl]methyl]urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21F3N4O3S
assistant