Test cleavage followed by MALDI analysis confirmed the peptide was formed. It did not show any precipitate in super cold ether when I tried to cleave it from rink amide resin using cocktail 90:5:5 TFA/TIPS/H2O. It is a 9 residue peptide containing all hydrophobic residue like Aib. It does not contain any side chain protecting amino acid. Is there any other methods to solve this particular problem?