prov:value
| - In the general formula (VIII), p4, q4, r4, p5, q5 and r5 are, independently of one another, 0 or 1, p4+q4+r4 and p5+q5+r5 are, independently of each other, 2 or 3, R4 and R5 are, independently of each other, a hydrogen atom, a methyl group or a hydroxyl group, with the proviso that when each of R4 and R5 is a hydroxyl group, p4, q4, r4 and q5 are each 1, and v2 is a number of 0 to 5.
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