Atropine, C₁₇H₂₃NO₃, is a poisonous alkaloid isolated from the leaves and roots of Atropa belladonna, the deadly nightshade. In small doses, atropine acts as a muscle relaxant; 0.5ng (nanogram, 10^?9 g) is sufficient to cause pupil dilation. On basic hydrolysis, atropine yields tropic acid, C₆H₅CH (CH₂OH) CO₂H, and tropine, C₈H₁₅NO. Tropine is an optically inactive alcohol that yields tropidene on dehydration with H₂SO₄. Propose a structure for atropine.

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CH3 Tropidene