Using CCOC(=O)CC1(C)C=CC=C2C=c3[nH]c(=O)c(=O)[nH]c3=C21 to produce CC1(CC(=O)O)C=CC=C2C=c3[nH]c(=O)c(=O)[nH]c3=C21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.