Using CCCS(=O)(=O)c1ccc2c(c1)CCN2c1cc(OC2CCN(C(=O)n3ccnc3)CC2)ncn1 to produce CCCS(=O)(=O)c1ccc2c(c1)CCN2c1cc(OC2CCNCC2)ncn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.