Using C=CC(=O)OC12CC3CC(C1)CC(C(=O)O)(C3)C2, C=C(C)C to produce C=CC(=O)OC12CC3CC(C1)CC(C(=O)OC(C)(C)C)(C3)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.