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Thiol Group Definition

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This is the chemical structure of cysteine.

This is the chemical structure of cysteine. The yellow SH on the left hand side is a thiol group.

Todd Helmenstine

Definition: A thiol group is a fuctional group containing a sulfur atom bonded to a hydrogen atom. General formula: -SH

Also Known As: sulfanyl group, mercapto group

Examples: The amino acid cysteine contains a thiol group.

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