Using COCCOc1nc(N)c2[nH]cnc2n1, CCOP(=O)(CCCBr)OCC to produce CCOP(=O)(CCCn1cnc2c(N)nc(OCCOC)nc21)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.