Using Nc1nc2c(sc(=O)n2COC(COC(=O)c2ccccc2)COC(=O)c2ccccc2)c(=O)[nH]1 to produce Nc1nc2c(sc(=O)n2COC(CO)CO)c(=O)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.