You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5R,8'S)-1-butylspiro[1,3-diazinane-5,9'-2,13,19-triazatetracyclo[9.8.0.02,8.013,18]nonadeca-1(11),14,16,18-tetraene]-2,4,6,12'-tetrone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N5O4
assistant