Using CC(C)(C)OC(=O)c1ccc(CCN2CCP(=O)(c3ccccc3)CC2)cc1 to produce O=C(O)c1ccc(CCN2CCP(=O)(c3ccccc3)CC2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.