thetin
noun
the·tin
ˈthētᵊn
variants
or less commonly thetine
",
-ēˌtēn
plural -s
: any one of a class of sulfonium carboxylates that are analogous to the betaines
dimethyl-thetin, (CH3)2S+CH2COO−
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Merriam-Webster unabridged
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