prov:value
| - n additionally contain another hetero atom from the series consisting of O, S and N; p is an integer from 1 to 100; q is an integer from zero to 22; R5 is hydrogen or a functional group such as hydroxyl, amino, NHR7, COOH, CONH2, COOR8 or halogen, in which R7 is C1 -C6 -alkyl and R8 is C1 -C4 -alkyl; Z, Z' are, independently of one another, hydroxyl, mercapto, SeH, C1 -C22 -alkoxy, --O--(CH2)b --N
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