Using [NH4+], O=C(O)CC1(C(=O)O)CCn2c(cc3ccccc32)C1 to produce O=C1CC2(CCn3c(cc4ccccc43)C2)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.