| http://www.w3.org/ns/prov#value | - ereof ; R7 is a hydrogen, hydroxy group, or a C1 to C20 alkyl group, preferably a hydrogen or a hydroxy group, more preferably a hydroxy group ; R8 is a hydrogen, hydroxy group, or a C1 to C22 alkyl group, (which can be an ester, amide, or ether interrupted group) ; preferably a C1 to C22 alkyl group ; more preferably a C1 to C8 alkyl group, and even more preferably a methyl group, atert- amyl g
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