<x-flowed>Jason-
See the excellent article on modifications of 431A cycles for
synthesis of long peptides by David King in ABRF News:
http://www.abrf.org/ABRFNews/1996/December1996/Long_PepSyn.html
Note that he uses DCC and HOBt rather than the more expensive
coupling reagents you ask about. We use his procedures; they are
foolproof and give extremely pure peptide.
David
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