You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,9R,10R)-6-pyridin-2-yloxy-17-azatetracyclo[7.5.3.01,10.02,7]heptadeca-2(7),3,5-triene by IUPAC nomenclature, provide its molecular formula.
user
C21H24N2O
assistant