Using COCCBr, CCc1ccccc1Nc1c(C(N)=O)cnc2cc(O)c(OC)cc12 to produce CCc1ccccc1Nc1c(C(N)=O)cnc2cc(OCCOC)c(OC)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.