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    Science. 1969 Jun 20;164(3886):1401-2.

    2,3-cis-3,4-trans-3,4-dihydroxy-L-proline: mass spectrometry and X-ray analysis.

    Abstract

    Mass spectrometry showed the new amino acid from diatomn cell walls to be a dihydroxyproline. X-ray analysis of the unmarked free amino acid by the use of the symbolic addition procedure revealed the comnplete three-dimtensional structure as 2, 3-cis-3, 4-trans-3, 4-dihydroxy-L-proline with carbon number 3 being 0.06 angstrom above the plane of the pyrrolidine ring.

    PMID:
    5783710
    [PubMed - indexed for MEDLINE]

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