(comparative more sigmatropic, superlative most sigmatropic)
"sigmatropic." YourDictionary, n.d. Web. 19 January 2019. <https://www.yourdictionary.com/sigmatropic>.
sigmatropic. (n.d.). Retrieved January 19th, 2019, from https://www.yourdictionary.com/sigmatropic
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