| prov:value
| - in which n is 1, 2 or 3, preferably 1 or 2, with particular preference 1, X may be identical or different and is a halogen (F, Cl, Br and I, especially Cl and Br), alkoxy (especially C1-4 alkoxy, such as methoxy, ethoxy, n-propoxy, isopropoxy and butoxy, for example), aryloxy (especially C6-10 aryloxy, e.g. phenoxy), acyloxy (especially C1-4 acyloxy, such as acetoxy and propionyloxy, for example)
|