| http://www.w3.org/ns/prov#value | - R1, R2 and R5 are independently selected from the group consisting of H and C1???C2 alkyl; R3 and R4 are selected from C2???C8 alkyl; R6 is selected from H or the L-isomer (amino acid convention) of R7???(CH2)n??????HC(NH2)???CO???; wherein n is an integer from 0 to 3; R7 is selected from the group C3???C6 alkyl or aryl (unsubstituted or mono-substituted with hydroxy, halo, amino, nitro, methyl or
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