| http://www.w3.org/ns/prov#value | - --M-Rd wherein Rd is lower alkyl(C3 -C8), lower alkenyl(C3 -C8), --(CH2)p -cycloalkyl(C3 -C6) when M is O, S, NH, NCH3, and the moiety --M-Rd wherein Rd is selected from the moieties: ##STR76## wherein p is zero to four and M is a bond or M is selected from O, S, NH, NCH3 ; wherein R1, R2 and Ra are as hereinbefore defined;
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