Using CCOC(=O)C=Cc1csc(-c2cc(OC)c(OC)c(OC)c2)n1 to produce CCOC(=O)CCc1csc(-c2cc(OC)c(OC)c(OC)c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.