You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-(2-methyl-4-nitroimidazol-1-yl)-N-[1-(4-pyridin-2-ylpiperazin-1-yl)propan-2-yl]propanamide by IUPAC nomenclature, provide its molecular formula.
user
C19H27N7O3
assistant