You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[5-[2-[4-(4-amino-2-butyl-3H-imidazo[4,5-c]quinolin-8-yl)piperazin-1-yl]ethoxy]pentoxy]propanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H42N6O4
assistant