You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (11R)-7-chloro-4-[(2R,6S)-2,6-dimethylmorpholin-4-yl]-6-(2-fluoro-6-hydroxyphenyl)-13-prop-2-enoyl-9-oxa-1,5,13-triazatricyclo[9.4.0.03,8]pentadeca-3(8),4,6-trien-2-one by IUPAC nomenclature, provide its molecular formula.
user
C26H28ClFN4O5
assistant