You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1S,7S,9R,11S)-2',2',10,10-tetramethylspiro[3,13-diazatetracyclo[5.5.2.01,9.03,7]tetradecane-11,6'-8H-pyrano[3,2-f]indole]-2,7',14-trione .
user
C26H29N3O4
assistant