You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(11S)-5-ethyl-N-[2-(4-fluorophenyl)ethyl]-8-methyl-6,9,13-trioxo-2-oxa-5,8,12-triazabicyclo[12.4.0]octadeca-1(18),14,16-triene-11-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H31FN4O5
assistant