prov:value
| - R is a C1 -C6 straight or branched chain alkyl or alkenyl group optionally substituted with C3 -C8 cycloalkyl, C3 or C5 cycloalkyl, C5 -C7 cycloalkenyl, or Ar1, where said alkyl, alkenyl, cycloalkyl, or cycloalkenyl groups may be optionally substituted with C1 -C4 alkyl, C1 -C4 alkenyl, or hydroxy, and where Ar1 is selected from the group consisting of 1-napthyl, 2-napthyl, 1-indolyl, 2- indolyl,
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