Using O=C(c1cccnc1Oc1cc(Cl)c(Br)cc1Cl)N1CCN(C2CC2)c2ccccc21, C=CC(=O)OCC to produce CCOC(=O)C=Cc1cc(Cl)c(Oc2ncccc2C(=O)N2CCN(C3CC3)c3ccccc32)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.