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The first formula given has no sulphur in it. — Preceding unsigned comment added by 87.194.42.37 ( talk) 14:43, 20 February 2012 (UTC) reply

See the cited references. A single study, a primary source, does not replace existing references. The Raman study abstract says that thiophenic ring are "usually present" in the samples. I lack access to the article, does it redefine the formula and has it been verified elsewhere and accepted as a "new" formula? Vsmith ( talk) 14:58, 20 February 2012 (UTC) reply