Using CCCCCc1cc(O)c2c(c1)OC(C)(C)[C@H]1CC=C(C(=O)O)C[C@H]21, O=C1CCC(=O)N1O to produce CCCCCc1cc(O)c2c(c1)OC(C)(C)[C@H]1CC=C(C(=O)ON3C(=O)CCC3=O)C[C@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.