| http://www.w3.org/ns/prov#value | - m the group consisting of HNHCHR4 --, R5 NHCHR4 --, R5 NHCHR4 --, ##STR20## R4 is selected from lower alkyl having two or five carbon atoms, or a naturally occurring amino acid side-chain; and R5 is selected from the group consisting of CH3 --, HCO--, CH3 CO-- and X--CH2 CO-- wherein X is a halogen atom; and stereoisomers thereof. 10.
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