You know what it looks like… but what is it called?
TAKE THE QUIZ“thiosulfuric”
We have one entry that includes the term thiosulfuric.
thiosulfuric acid
noun: an unstable acid H2S2O3 derived from sulfuric acid by replacement of one oxygen atom by sulfur and known only in solution or in the form of salts and esters
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Merriam-Webster unabridged