Using COC(=O)C1CN(C(=O)OCc2ccccc2)C2CCN(C(=O)C(NC(=O)OC(C)(C)C)C3CCCCC3)C12 to produce COC(=O)C1CNC2CCN(C(=O)C(NC(=O)OC(C)(C)C)C3CCCCC3)C21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.