Using CCOC(=O)Cc1coc2c(C)c(Oc3ccc(OC)cc3)c(C)cc12 to produce CCOC(=O)Cc1coc2c(C)c(Oc3ccc(O)cc3)c(C)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.