prov:value
| - the group consisting of glycine, alanine, leucine, isoleucine, norleucine, phenylalanine, tyrosine, lysine, arginine, histidine, aspartic acid, asparagine, glutamic acid, glutamine, serine, and threonine; Rf is a single bond, or Rf is an amino acid of the formula --COCH(Z')NH-- provided that when Re is an amino acid, Rf is other than an amino acid, wherein Z and Z' are each independently selected
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