Using O=Cc1ccc2c(c1)OCO2, O=c1ccoc2cc(O)ccc12 to produce O=C1C(=Cc2ccc3c(c2)OCO3)COc2cc(O)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.