You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl (3R,4S)-1-(2-methoxyethyl)-4-(3-methoxyphenyl)-2-oxo-3,4-dihydropyrimido[1,2-a]benzimidazole-3-carboxylate ?
user
C23H25N3O5
assistant