Poisonous compound found in deadly nightshade — a protein (anag) (8)

I believe the answer is:

atropine

(Other definitions for atropine that I've seen before include "A pointer (anag) - belladonna" , "Drug obtained from deadly nightshade" , "Poisonous substance" , "Poison found in deadly nightshade used as a drug" .)

I've seen this clue in The Guardian.

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