Using C=C(C)C(=O)OC1C(C)(C)C(O)C1(C)C, C=C1CC(=O)O1 to produce C=C(C)C(=O)OC1C(C)(C)C(OC(=O)CC(C)=O)C1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.