Using CCOC(=O)Cc1c(-c2ccccc2)c2cc3c(cc2oc1=O)C(=O)CC3 to produce O=C(O)Cc1c(-c2ccccc2)c2cc3c(cc2oc1=O)C(=O)CC3, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.