penta- + thionic + acid, since it contains five atoms of sulphur.
"pentathionic-acid." YourDictionary, n.d. Web. 24 March 2019. <https://www.yourdictionary.com/pentathionic-acid>.
pentathionic-acid. (n.d.). Retrieved March 24th, 2019, from https://www.yourdictionary.com/pentathionic-acid
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