| http://www.w3.org/ns/prov#value | - Novel intermediates of formula (IV) wherein R.sup.x is other than R when R.sub.1 ', R.sub.2 ', R.sub.3 ', R.sub.4 ', R.sub.5 ' and R.sub.6 ' are R.sub.1, R.sub.2, R.sub.3, R.sub.4,R.sub.5 and R.sub.6 also form part of the invention.Compounds of formula (IV) where R.sub.1 ' is --(A)--OH or --(A)--CH.sub.2 OH may be converted to compounds with R.sub.1 as defined in (a) where C is --OCH.sub.2 -- or -
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