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 1,7-dimethyl-9-[9-(1-methyl-7-propan-2-yloxypyrido[3,4-b]indol-9-yl)nonyl]pyrido[3,4-b]indole .
user
C37H44N4O
assistant