You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S,3R)-3-[(2-aminopyridin-4-yl)methyl]-2-N-methyl-2-N-(1-methylimidazol-2-yl)-1-N-[1-(3-methylphenyl)propyl]-4-oxoazetidine-1,2-dicarboxamide by IUPAC nomenclature, provide its molecular formula.
user
C26H31N7O3
assistant