You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-cyclopropyl-14-methyl-4,5,10,13,14,19,22,24-octazapentacyclo[15.5.2.12,5.012,16.020,23]pentacosa-1(22),2(25),3,12,15,17,19,23-octaen-9-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N8O
assistant