Using O=C(CCCN1CCCCC1)c1ccc2c(c1)Cc1cc(C(=O)CCCN3CCCCC3)ccc1O2, O=[Cr](=O)([O-])O[Cr](=O)(=O)[O-] to produce O=C(CCCN1CCCCC1)c1ccc2oc3ccc(C(=O)CCCN4CCCCC4)cc3c(=O)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.