Using CON(C)C(=O)CCc1nnc(-c2ccc3c(c2)CCO3)o1, Br[Mg]c1cccs1 to produce O=C(CCc1nnc(-c2ccc3c(c2)CCO3)o1)c1cccs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.