1-[(1'R,4R,10'S)-1,1-dioxo-2-propylspiro[1,2,5-thiadiazolidine-4,13'-tricyclo[8.2.1.03,8]trideca-3(8),4,6-triene]-5'-yl]-3-(4-fluorophenyl)propane-1,3-dione is the IUPAC name of a molecule. Please give its molecular formula.