You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[amino-(6-ethoxy-6,7-dihydro-5H-pyrazolo[5,1-b][1,3]oxazin-3-yl)-oxo-lambda6-sulfanylidene]-3-(7-fluoro-2-tricyclo[6.3.0.03,6]undeca-1(8),2,6-trienyl)urea is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H24FN5O4S
assistant