You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(2-amino-4-hydroxy-3-methyl-4-pyridin-2-ylbutanoyl)amino]-2-[(2R,3S,4R,5R)-5-(5-formyl-2-oxo-1H-imidazol-3-yl)-3,4-dihydroxyoxolan-2-yl]acetic acid into its molecular formula.
user
C20H25N5O9
assistant