You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,9R,13R)-6-ethoxy-10-(4-fluorophenyl)-N-(4-methoxyphenyl)-9-methyl-11-sulfanylidene-8-oxa-10,12-diazatricyclo[7.3.1.02,7]trideca-2(7),3,5-triene-13-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26FN3O4S
assistant