Using CC(C)(C)OC(=O)n1cnc(CC(=O)O)c1, CCOP(=O)(OCC)C(N)P(=O)(OCC)OCC to produce CCOP(=O)(OCC)C(NC(=O)Cc1cn(C(=O)OC(C)(C)C)cn1)P(=O)(OCC)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.