The Ra calculation suggests a compatibility in the following order: pBuOzi > pPrOzi ≈ pPentOx > pBuOx (Figure ). The experimental formulation results showed that A-pPentOx-A and A-pPrOzi-A formulation completely precipitated and ERL amounts were below the limit of detection in HPLC. For A-pBuOx and A-pBuOzi-A, the solubilizing capacity was also very low.