| http://www.w3.org/ns/prov#value | - 22## in which A is alkyl or alkanoyl; and ##STR23## in which R is hydrogen, alkanoyloxy, or ##STR24## each of R' and R is alkanoyloxy or ##STR25## x has a value of from 1 to 6, inclusively, wherein each of y, z, n and m independently has a value of from 0 to 6, inclusively, at least one of y, z, n and m having a value other than 0 and the sum of n and m being no greater than 6 and being at l
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