You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[4-[(2-methylpropan-2-yl)oxycarbonyl]piperazin-1-yl]imidazo[1,2-a]pyridine-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O4
assistant