Using CCOP(=O)(OCC)C(NC(=O)c1cc2ccccc2s1)P(=O)(OCC)OCC to produce O=C(NC(P(=O)(O)O)P(=O)(O)O)c1cc2ccccc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.