Using CCOC(=O)CC1Cc2cc(C=O)c(OC)cc2Cc2ccccc21 to produce CCOC(=O)CC1Cc2cc(C)c(OC)cc2Cc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.