You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9S,12R)-12-(3,4-dimethylphenyl)sulfonyl-4-methoxy-9,10-dimethyl-8-oxa-10-azatricyclo[7.3.1.02,7]trideca-2(7),3,5-trien-11-one by IUPAC nomenclature, provide its molecular formula.
user
C22H25NO5S
assistant