| http://www.w3.org/ns/prov#value | - 2-hydroxyethyl, 3-hydroxypropyl, and 2-hydroxypropyl. Preferably, at least one of R.sup.4 or R.sup.5 is other than hydrogen. More preferably, R.sup.4 and R.sup.5 are each a linear or branched alkyl group or linear or branched hydroxyalkyl group. If
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