Using CNC(=O)c1cc(COC(=O)NCC2CCN(C(=O)OC(C)(C)C)C2)on1 to produce CNC(=O)c1cc(COC(=O)NCC2CCNC2)on1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.