| http://www.w3.org/ns/prov#value | - n atom or a C1 -C4 alkyl group; R4 and R5 are independently a C1 -C4 alkyl group which may be substituted with a hydroxyl group, a halogen atom, a cyano group, or a C1 -C4 alkoxy group; and a is an integer of 1 to 3; A- is a counter anion consisting of an organic acid having 4 to 20 carbon atoms; and n is a numerical value of not more than 1; and(ii) an alcoholic organic solvent. 2.
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