| http://www.w3.org/ns/prov#value | - in that either or both of the oxygen atoms constituting the --O--O-- peroxide group are O.sup.17 isotopes, whether in whole or in part.Among these compounds, the invention especially relates to compounds wherein more than 0.1% by weight of the peroxide oxygen --O--O-- comprises the O.sup.17 isotope, this proportion preferably being greater than 1% and less than 80%.
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