Using COC(=O)[C@H](C)NC(=O)CCn1cc(C2=C(c3cn(C)c4ccccc34)C(=O)NC2=O)c2ccccc21 to produce C[C@H](NC(=O)CCn1cc(C2=C(c3cn(C)c4ccccc34)C(=O)NC2=O)c2ccccc21)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.