You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,4S,5R,6R,12R)-6-(2,4-dimethoxyphenyl)-10,10-dimethyl-3-oxo-N-phenyl-2-oxatricyclo[6.3.1.04,12]dodec-7-ene-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C28H31NO5
assistant