prov:value
| - .3, R.sup.4, R.sup.6 are each hydrogen, R.sup.5 is methyl, n is the number 3, 4 or 5, X is an oxygen atom and (R.sup.7)n are n radicals R.sup.7 which are identical or different,R.sup.7 in each case being halogen, hydroxyl, amino, nitro, formyl, carboxyl, cyano, (C.sub.1 -C.sub.6)alkyl, (C.sub.1 -C.sub.4)alkoxy, halo-(C.sub.1 -C.sub.4)alkyl, halo-(C.sub.1 -C.sub.4)alkoxy, hydroxy-(C.sub.1 -C.sub.4)
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