Abstract
ISOVALTHINE crystals first isolated from urine were rhombic plates which gave DL-alanine after treatment with Raney nickel. Needle-shaped crystals were obtained by condensation of L-cysteine and (±)-α-bromoisovaleric acid. They were a mixture of L- and L-allo-isovalthine, and readily converted into the rhombic form by heating in hydrochloric acid1,2.
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References
Mizuhara, S., and Ohmori, S., Arch. Biochem. Biophys., 92, 53 (1961).
Ohmori, S., and Mizuhara, S., Arch. Biochem. Biophys., 96, 179 (1962).
Ubuka, T., J. Biochem., 52, 440 (1962).
Tukutome, K., Acta Med. Okayama, 16, 241, 247 (1962).
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OHMORI, S., UBUKA, T., KUWAKI, T. et al. Configuration of Urinary Isovalthine. Nature 200, 678–679 (1963). https://doi.org/10.1038/200678b0
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DOI: https://doi.org/10.1038/200678b0
