Using Cc1nc2c3c(ccn2c1C)C(=O)C(O)C(c1ccccc1)N3 to produce Cc1nc2c3c(ccn2c1C)C(O)C(O)C(c1ccccc1)N3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.