Using COC(OC)OC, O=C1COC2C(OCc3ccccc3)CN(C(=O)OCc3ccccc3)C12 to produce COC1(OC)COC2C(OCc3ccccc3)CN(C(=O)OCc3ccccc3)C21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.