Using CCOP(=O)(COCC(CO)On1cnc2c(N)nc(N)nc21)OCC to produce Nc1nc(N)c2ncn(OC(CO)COCP(=O)(O)O)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.