| http://www.w3.org/ns/prov#value | - A compound having the formula: ##STR7## wherein m is an integer 0 or 1;AA.sub.1 is phenylalanine, naphthylalanine, tryptophan tyrosine or .epsilon.-amino blocked lysine;AA.sub.2 is leucine;R.sub.1 is hydrogen, alkyl having 1-10 carbon atoms, alkanoyl having from 2-10 carbon atoms or aroyl having from 7-11 carbon atoms;R.sub.2 is hydrogen or alkyl having from 1-6 carbon atoms;R.sub.3 is alkyl havin
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