prov:value
| - Preferably 90 to 100% of the radicals R.sub.6, R.sub.6', R.sub.6'', R.sub.6''', R.sub.6*, R.sub.7, R.sub.7' and R.sub.7'' are C.sub.1-C.sub.4-alkyl, in particular methyl, and 0 to 10% of the radicals R.sub.6, R.sub.6', R.sub.6'', R.sub.6'''',
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