You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 18-propan-2-ylspiro[2,12,16,19-tetrazapentacyclo[11.8.0.02,10.03,8.015,20]henicosa-1(13),3,5,7,9,14,18,20-octaene-11,1'-cyclohexane]-17-one .
user
C25H26N4O
assistant