| http://www.w3.org/ns/prov#value | - A compound of formula I: ##STR12##where: A is ##STR13## ##STR14## or ##STR15## Y is --E--C(O)R.sup.1 or --E--NR.sup.2 R.sup.3 ; E is a bond or --CH.sub.2 --; R.sup.1 is independently at each occurrence hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.8 cycloalkyl, optionallysubstituted (C.sub.1 -C.sub.4 alkyl)-aryl, optionally substituted aryl, optionally substituted heterocycle, or NR.sup.2 R.sup
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