You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ditert-butyl (1S,2R,3S,4R)-4-hydroxy-4-methyl-2-(4-nitrophenyl)-6-oxocyclohexane-1,3-dicarboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H31NO8
assistant