You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-(2,4,6-trimethylphenyl)-2-oxa-5,9,13-triazatricyclo[8.4.0.03,8]tetradeca-1(10),3(8),4,6,11,13-hexaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H17N3O
assistant