| http://www.w3.org/ns/prov#value | - CH3)2, R4 is hydrogen, a C1 to C18 alkyl group, a C6 to C18 aryl group, --CH2 --C6 H5, or a C5 to C18 cycloalkyl group, R5 and R6 are a C1 to C18 alkyl group, a C6 to C18 aryl group, or a C5 to C18 cycloalkyl group, and Z is Cl, Br, I, NO3, a C1 to C8 alkylsulfate group, --CH3 COO-, BF4 - or PF6 -.
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