A number of non-protein amino acid derivatives are found in the natural mushrooms, and a few of them are toxic for a human. We analysed the water soluble low molecular weight compounds of the fruit bodies of Pleurocybella porrigens ("Sugihiratake" in Japanese, angel's wings in English) using a high resolution 1H NMR spectroscopy.
  An aziridine derivative; 3,3-Dimethylaziridine-2-carboxylic acid (1) from the fruit body of mushroom P. porrigens presumed to be a cause of acute encephalopathy happened in Japan at 2004.

keywords; aziridine, Pleurocybella porrigens, encephalopathy, sugihiratake,

  Next, we show the abstract which is presented in "Abstracts of Papers Presented at the 50th Anniversary Meeting of the Mycological Societty of Japan (June 3-4, 2006, Chiba, Japan)".

Reference
M. P. Sammes and A. Rahman The photochemical synthesis of alkyl 2,2-dimethyl-3-(2-methylpropenyl)aziridine-1-carboxylates and 3,3-dimethylaziridine-1,2-dicarboxylates from alkyl azidoformates. J. Chem. Soc., Perkin Trans. 1, 1972, 344 - 346.

An additional reference
Aoyagi Y. Sugahara T. Beta-Hydroxy-L-valine from Pleurocybella porrigens , Phytochemistry 1988; 27: 3306-3307.