A lysergic acid derivative that acts as a selective serotonin receptor antagonist, and is sometimes used, usually in the form of its maleate, for the prevention of severe migraine and cluster headaches; 1-methyl- d- lysergic acid butanolamide, C₂₁ H₂₈ N₃ O₂.

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Connections NYT: Hints For Today's Puzzle, Tue, Jan 13

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