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-O-benzyl 9-O-tert-butyl (1R)-1-(2-oxoethyl)-3,4-dihydro-1H-pyrido[3,4-b]indole-2,9-dicarboxylate .
user
C26H28N2O5
assistant