| http://www.w3.org/ns/prov#value | - Scheme 2 refers to an alternative preparation of compounds of the formula I, wherein A is --CH.sub.2CH.sub.2--, one of R.sup.3 or R.sup.4 is hydroxy and the other of R.sup.3 or R.sup.4 is hydrogen and R.sup.1 is other than alkenyl, from compounds
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