Using CCOC(=O)CC1OB(O)c2cc(O)cc(OCc3ccccc3)c21 to produce O=C(O)CC1OB(O)c2cc(O)cc(OCc3ccccc3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.