Using CC(C)(C)OC(=O)N1C2CCC1CN(CC(=O)Nc1cccc3c1CC(=O)N3)C2 to produce O=C1Cc2c(cccc2NC(=O)CN2CC3CCC(C2)N3)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.