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 (9E)-5-methyl-1'-(2-methylpropanoyl)spiro[2-oxa-5,12-diazabicyclo[12.4.0]octadeca-1(18),9,14,16-tetraene-7,3'-piperidine]-6,13-dione .
user
C24H33N3O4
assistant