Using C=CCc1cc2c(-c3cc(OC)c(OC)c(OC)c3)coc2cc1O to produce CCCc1cc2c(-c3cc(OC)c(OC)c(OC)c3)coc2cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.