Using O=C(O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21, CC(C)(C)OC(=O)NCCOCCOCCN to produce CC(C)(C)OC(=O)NCCOCCOCCNC(=O)CCCC[C@@H]1SC[C@@H]2NC(=O)N[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.