Using CCCCOc1ccc(-c2nc3cnc(C(=O)NCC(=O)OC)c(O)c3s2)cn1 to produce CCCCOc1ccc(-c2nc3cnc(C(=O)NCC(=O)O)c(O)c3s2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.