Using CCOCc1cccc2[nH]c3cnc(C(=O)OCC)c(C)c3c12 to produce CCOCC1CCCc2[nH]c3cnc(C(=O)OCC)c(C)c3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.