Using CCOC(=O)CC1(CC)OCCc2c1[nH]c1c(C(C)C)cc(Br)cc21 to produce CCC1(CCO)OCCc2c1[nH]c1c(C(C)C)cc(Br)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.