You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 16,16,20-trimethyl-24-oxa-7-azahexacyclo[19.2.1.05,23.06,15.08,13.017,22]tetracosa-1,3,5(23),6,8,10,12,14,17(22),18,20-undecaene ?
user
C25H19NO
assistant