You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-hydroxy-N-[2-(3-hydroxy-3-methylbutyl)-7-methoxyimidazo[1,2-a]pyridin-6-yl]-1-methyl-2H-pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26N4O4
assistant