| http://www.w3.org/ns/prov#value | - where R5, R6, R7 and R8 are, independently, substantially straight chain hydrocarbyl groups (e.g., alkyl, alkenyl, alkoxyalkyl, poly(alkoxy)alkyl, etc., groups which are either non-branched or if branched, have branching in remote positions that do not provide steric hindrance), and X is an anion such as a halide ion.
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