Using CCOC(=O)C1(CSc2nc3ccccc3[nH]2)OC(=O)C(O)=C1Sc1nc2ccccc2[nH]1 to produce O=C1OC(CSc2nc3ccccc3[nH]2)(C(=O)O)C(Sc2nc3ccccc3[nH]2)=C1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.