Using OCCOCCOCCCl, CCCC(=O)c1cnc2c(O)cccc2c1Nc1ccccc1C to produce CCCC(=O)c1cnc2c(OCCOCCOCCO)cccc2c1Nc1ccccc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.