prov:value
| - In at least one embodiment, Y is a group chosen from oxazolium, isoxazolium, thiazolium, isothiazolium, 1,2,4-triazolium, 1,2,3-triazolium, 1,2,4-oxazolium, 1,2,4-thiadiazolium, pyrylium, pyridinium, pyrimidinium, pyrazinium, pyridazinium, triazinium, and imidazolium, benzoimidazolium, benzoxazolium, benzothiazolium, these groups being optionally substituted with at least one (C1-C4)alkyl groups,
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