Using Clc1ccc2nnc(-c3cccs3)n2n1, CCOC(=O)C(O)CC to produce CCOC(=O)C(CC)Oc1ccc2nnc(-c3cccs3)n2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.