Using CCOC(=O)c1[nH]c(C=CC(=O)OC(C)(C)C)cc1C to produce CCOC(=O)c1[nH]c(CCC(=O)OC(C)(C)C)cc1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.