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 5-amino-14,17,20-trioxa-4,8,22,27-tetrazatetracyclo[19.3.1.12,6.19,13]heptacosa-1(25),2,4,6(27),9(26),10,12,21,23-nonaen-7-one .
user
C20H19N5O4
assistant