COMU,Peptide synthesis, Coupling reagents, High yield coupling, RACEMIZATION,Fast coupling, peptides, proteins, amino acids, difficult couplings, SPPS, HATU, PyClock, HBTU, TBTU, Oxyma Pure, Racemization suppression, additives, Racemization, peptides, proteins, HOBt, HOCt, HOAt, coupling, reagents, synthesiser, SPPS, Dipeptides, amide formation, amino acids, polymer bound