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Glutathione: spot the stereochemistry flaw

Single question

Two-step SPPS-style coupling: gamma-glutamyl-cysteine then glycine to give glutathione. The chemistry is right. Read the cysteine stereocenter.

L vs D cysteine assignment
CIP priorities flipped on cysteine (R is the L isomer)
Why D-cysteine glutathione is not enzymatically equivalent

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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