| http://www.w3.org/ns/prov#value | - Rn] wherein n is a positive integer, where each R is the same or different and is aliphatic or aromatic hydrocarbyls having from 1 to 18 carbon atoms, and X is an atom having a permanent charge selected from Group 15 of the Periodic Table and wherein n is such that the ability of X to form additional chemical bonds is exhausted.
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