Using CCOCCl, C[C@@H](O)CCCCn1c(=O)c2[nH]c(Br)nc2n(C)c1=O to produce CCOCn1c(Br)nc2c1c(=O)n(CCCC[C@@H](C)O)c(=O)n2C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.