Using CCOP(=O)(CCCCn1cnc2c1c(=O)n(Cc1ccccc1)c(=O)n2C)OCC to produce CCOP(=O)(CCCCn1cnc2c1c(=O)[nH]c(=O)n2C)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.