Two cyclopropyl derivatives are among a large group of newly characterized amino acids isolated from higher plants (reviews: Hunt, 1959;Fowden, 1958Fowden, , 1960. These two compounds were identified as 1-aminocyclopropane-l-carboxylic acid, isolated from perry pears by Burroughs (1957) and from cowberries (Vaccinium viti8-idaea) by Vahatalo & Virtanen (1957), and ,-(methylenecyclopropyl)alanine (I, hypoglycin A), isolated from the fruits of the tropical plant Blighia 8apida (Hassall, Reyle
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