| http://www.w3.org/ns/prov#value | - --W[C(O)].sub.kZ(CR.sup.9R.sup.10).sub.rCO.sub.2R.sup.11, each of R.sup.5, R.sup.6, R.sup.7 and R.sup.8 is independently hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, C.sub.1-4 alkoxycarbonyl, carboxyl, halo or hydroxyl, W is a bond, k is 1, Z is O, r is
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