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 ethyl 6-[5-[[(2S)-1,4-bis[2-[4-(1-methylpyridin-1-ium-4-yl)pyridin-1-ium-1-yl]ethylamino]-1,4-dioxobutan-2-yl]carbamoyl]pyridin-2-yl]pyridine-3-carboxylate .
user
C44H47N9O5+4
assistant