| http://www.w3.org/ns/prov#value | - R2O???CO???CR???CR???CO???O, RCH???CH???CO???O???, RCH???C(COOR2)CH2???CO???O, A is ???O??? or NR1; A1 is selected from a bond, (CH2)IA2 and (CH2)I SO3??? in which I is 1 to 12; A2 is selected from a bond, ???O???, O???CO???, CO???O, CO???NR1???, ???NR1???CO, O???CO???NR1???, NR1???CO???O???; R is hydrogen or C1-4 alkyl; R1 is hydrogen, C1-4-alkyl or BX; R2 is hydrogen or C1-4 alkyl; B is a bond,
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