| http://www.w3.org/ns/prov#value | - group, or a heteroatom containing group, for example PR3, where R is an alkyl group, [0032] R1 and R2 may be interconnected to each other, and/or R4 and R5 may be interconnected to each other, [0033] R6 and R7 are independently absent, or hydrogen, an alkyl group, halogen, heteroatom or a hydrocarbyl group, preferably a linear, cyclic or branched alkyl group having 1 to 20 carbon atoms, more pref
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