| http://www.w3.org/ns/prov#value | - wherein R.sub.6 is 2,4-dimethylphenyl, 2,4-di-tert.-butylphenyl, 4-methyl-2-tert.-butylphenyl or 4-methyl-2-cyclohexylphenyl, R.sub.7 is H or CH.sub.3 and L is a single bond or isopropylidene, such as, for example the following 4 compounds (-- is
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