Using CCOC(=O)c1cn(N2C(=O)c3ccccc3C2=O)c(C(=O)OCC)c1OC to produce CCOC(=O)c1cn(N)c(C(=O)OCC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.