Why does Ergothioneine primarily exist in its thione form under physiological conditions?

Label:chem

Topic
In aqueous solution, Ergothioneine (ERG) exists in two tautomeric forms: thiol and thione.
Answer
Under physiological conditions, Ergothioneine (ERG) primarily exists in its thione form because the thiocarbonyl group is more stable than the sulfhydryl group.
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