The residue that has been drawn incorrectly is option (B) i.e. glu .
Glutathione consists of a glutamate residue linked to cysteine via its γ-carboxyl rather than the α-carboxyl group and followed by a conventional peptide bond between cysteine and glycine.
It plays an important role in maintaining the proper ratio of oxidized to reduced forms of metabolically important thiols such as coenzyme A.
It also provides reducing equivalents that detoxify reactive oxygen species such as peroxides.
The tripeptide is regenerated through the concerted action enzymes in the so-called γ-glutamyl cycle.
The residue that has been drawn incorrectly is glutamate residue ,hence option (B) is correct.
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