Mercapto Group Definition

A chemical group showing a mercapto group
The left-hand side of this chemical group (cysteine) is a mercapto group. Todd Helmenstine

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

Also Known As: thiol group, sulfanyl group

Examples: The amino acid cysteine contains a mercapto group.