| http://www.w3.org/ns/prov#value | - R.sup.5 particularly preferably represents hydrogen, methyl, ethyl, n- or i-propyl, n-, i-, s- or t-butyl, propenyl, propinyl, cyclopropyl, cyclopentyl, cyclohexyl, cyclopropylmethyl, cyclopentylmethyl, cyclohexylmethyl, phenyl or benzyl. A.sup.1 very
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