You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,2S,3R,6R,7S,8R,9R,13R)-3,4,5,6-tetrachloro-11-methoxy-14-oxa-11-azapentacyclo[6.5.1.13,6.02,7.09,13]pentadec-4-ene-10,12-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H11Cl4NO4
assistant