Using COCCBr, COCCOc1c(O)cc([N+](=O)[O-])cc1C(=O)OC to produce COCCOc1cc([N+](=O)[O-])cc(C(=O)OC)c1OCCOC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.