Using c1c[se]c(-c2ccc(-c3ccc[se]3)[se]2)c1, C1CCOC1 to produce O=Cc1ccc(-c2ccc(-c3ccc[se]3)[se]2)[se]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.