prov:value
| - or substituted by one ormore radicals (C.sub.1 -C.sub.4)alkyl, or b1) R.sup.1 is (C.sub.1 -C.sub.4),alkyl which is unsubstituted or substituted by 1 to 4 substituents from the group consisting of (C.sub.1 -C.sub.4)alkoxy and hydroxyl, R.sup.2, R.sup.3, R.sup.4, R.sup.6 are eachhydrogen, R.sup.5 is methyl, n is the number 1, 2, 3 or 4, X is an oxygen atom and (R.sup.7).sub.n are n radicals R.sup.7
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