You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-O-[(2R)-1-[cyclohexyl(ethyl)amino]-1-oxopropan-2-yl] 1-O-methyl 5-nitrobenzene-1,3-dicarboxylate .
user
C20H26N2O7
assistant