prov:value
| - However, it can also be the acryl group ofa heterocyclic .alpha.-amino acid which occurs naturally as building blocks of peptides, such as prolyl, tryptophanyl or histidinyl.Cycloalkyl is, for example, 5- to 7-membered cycloalkyl such as, in particular, cyclohexyl or secondarily cyclopentyl or cycloheptyl.Aryl is, for example, phenyl or, in particular as R.sub.4, naphthyl.Heteroaryl is, for exampl
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