Using CC(C)(C)OC(=O)N[C@H]1Cc2cc(ccc2O)-c2ccc(O)c(c2)C[C@@H](C(=O)N[C@@H](C[C@@H](O)CN)C(=O)NCCN)NC(=O)[C@H](C[C@@H](O)CN(C(=O)O)C(C)(C)C)NC1=O to produce NCCNC(=O)[C@H](C[C@@H](O)CN)NC(=O)[C@@H]1Cc2cc(ccc2O)-c2ccc(O)c(c2)C[C@H](N)C(=O)N[C@@H](C[C@@H](O)CN)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.