Using COC(=O)C1(OC)CCN(C2CCCN(C(=O)OC(C)(C)C)CC2)CC1 to produce COC1(C(=O)O)CCN(C2CCCN(C(=O)OC(C)(C)C)CC2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.