| http://www.w3.org/ns/prov#value | - where k is, independently, an integer from 1 to 6 inclusive, preferably 3 to 5, l is an integer from 0 to 30 inclusive, preferably 4 to 9, and p is an integer from 1 to 3 inclusive, preferably 1; R, R1 and R2 are each independently defined as above; and Z is O, S, N(R), or is absent, i.e., a single bond;
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