| http://www.w3.org/ns/prov#value | - R8 and R9 is independently hydrogen;each of R6 and R7 independently represents hydrogen, -C1-C6 alkyl, -C2-C6 alkenyl, -(C1-C6 alkyl)CO2C1-C6 alkyl, -(C1-C6 alkyl)SC1-C6 alkyl, -(C1-C6 alkyl)OC1-C6 alkyl, benzoxy(C1-C6 alkyl), a side chain of a naturally occurring amino acid, a group -D as depicted above in this claim, wherein n is an integer from 0 to 3, and each of R8 and R9 is independently hy
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