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 10-piperazin-1-yl-3,8,16,21-tetraoxa-11-azatetracyclo[10.10.0.02,9.015,22]docosa-1(12),2(9),5,10,13,15(22),18-heptaene-4,7,17,20-tetrone .
user
C21H15N3O8
assistant