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 N-[2-(3,4-dimethoxyphenyl)ethyl]-7-(2-methoxyethyl)-8-oxo-5,6-dihydroimidazo[1,2-a]pyrazine-2-carboxamide .
user
C20H26N4O5
assistant