| http://www.w3.org/ns/prov#value | - up of formula R3X [ (-R4-) Oln (-R4)- where XisO, SorN, R3 is hydrogen or Ct-C20alkyl, R4 is Ci-Ci2alkylene, n is 0 or an integer from 1 to 6, or one of R1 and R2 is a group of formula or R2 is a group of formula (II) and Pi is a group of formula - [R4]n-N(R5)-A-[N(R)2]m where m is 0 or 1 and, when m is zero, A is a group of formula (II) and, when m is 1, A is al- kylene or C6-Cioarylene and R5 is
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