the field of chemistry or abbreviations recommended by the iupac iub commission on biochemical nomenclature for example the following symbols are used in the specification the amino acids should be construed to be of the l type unless specific description with respect to optical configuration is given ______________________________________ala a u03b2 alaninearg arginineala alanineasn asparagineaze azetidine 2 carboxylic acidcit citrullinecys cysteinegly glycinehar homoargininelys lysineorn ornithinepglu pyroglutamic acidpip pipecolic acidpro prolinesar sarcosineser serinethr threonineboc t butoxycarbonylz benzyloxycarbonylfmoc 9 fluorenylmethoxycabonylbu sup t t butylmbs p methoxybenzenesulfonylmbzl p methoxybenzylacm acetamidomethylscm s carbomethoxysulfenylmtr 4 methoxy 2 3 6 trimethylbenzenesulfonylno sub 2 nitrobzl benzylobzl benzyl esterosu n hydroxysuccinimide esterdcc n n 39 dicyclohexylcarbodiimidedcurea n n 39 dicyclohexylureadic n n 39 diisopropylcarbodiimidehobt 1 hydroxybenzotriazoleet sub 3 n triethylaminetrt tritylnmm n methylmorpholinetfa trifluoroacetic acidmsa methanesulfonic acidacoet ethyl acetateacoh acetic acidthf tetrahydrofurandmf n n 39 dimethylformamidemeoh methanol______________________________________ the compounds of the present invention can be prepared by the methods conventionally employed in peptide chemistry for example the peptides can be prepared by those processes described in schroder and lubke the peptides vol 1 academic press new york 1965 and nobuo izumiya et al fundamental and experiment of peptide synthesis maruzen tokyo 1985 and can be prepared by either the solution synthesis or the solid synthesis examples of the methods for formation of the peptide bonds include azide method acid chloride method symmetrical anhydride method mixed anhydride method carbodiimide method carbodiimido additive method activated ester method carbonyldiimidazole method oxidation reduction method and the one employing a woodward reagent k in.