prov:value
| - In formula (I), Z1, Z2 and Z3 may individually represent hydrogen, an alkali metal ion, particularly sodium and potassium, an alkyl group comprising up to about 8 carbon atoms, branched or unbranched, substituted or unsubstituted, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, pentyl, hexyl, 2-ethylhexyl, octyl, t-octyl, carboxyethyl, ethoxyethyl, 3-hydroxypropyl, and 1,3-dih
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