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 2-(1,3,4,9-tetrahydropyrido[3,4-b]indol-2-ylmethyl)-1,3,4,9-tetrahydropyrido[3,4-b]indole .
user
C23H24N4
assistant