| http://www.w3.org/ns/prov#value | - the group consisting of NHCHR4 --, R5 NHCHR4 --, R5 NHCHR4 --, ##STR2## R4 is selected from lower alkyl having from one to about five carbon atoms, or a naturally occurring amino acid side-chain, and R5 is selected from the group consisting of H, CH3 --, HCO--, CH3 CO-- and X--CH2 CO-- wherein X is a halogen atom and stereoisomers thereof.
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