Using O=C(O)C(CCC[C@@H]1SC[C@H]2[C@@H]1NC(=O)N2O)N1C(=O)CCC1=O, CCOCc1nc2c(N)nc3ccccc3c2n1CCN to produce CCOCc1nc2c(N)nc3ccccc3c2n1CCNC(=O)CCCCC1SCC2NC(=O)NC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.