Using CCOC(=O)Cn1c(NC2CCN(C(=O)OC(C)(C)C)CC2)nc2ccccc21 to produce CCOC(=O)Cn1c(NC2CCNCC2)nc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.