Using C#Cc1ccc(OCOCCOC)c(C23CC4CC(CC(C4)C2)C3)c1, O=Cc1ccc(Br)cc1 to produce COCCOCOc1ccc(C#Cc2ccc(C=O)cc2)cc1C12CC3CC(CC(C3)C1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.