| http://www.w3.org/ns/prov#value | - thereof, X6 is halogen, amino or O, and X7 is alkyl, alkoxy or aryloxy, or may be H only if X6 is O, with the proviso that at least one of R1, R2 and R3 is not hydrogen; Each of X1, X2, and X3 is independently selected from the group consisting of compounds of the formula --Xr --Y4 -- where r is an integer at least 1, each X is independently C or O, and each C can independently be substituted or u
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