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Porphyra tenera, an edible red alga, was found to contain a new acidic imino acid (C7Hl1NO4). This compound named teneraic acid is obtained from an alcoholic extract. The chemical structure of teneraic acid was determined to be piperidine-2, 6-dicarbcxylic acid by means of NMR, Mass, and IR spectrometric studies and by chemical synthesis. The con-figuration of the compound was proved to be a trans form by ORD spectrometry.
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Kawauchi et al. (1978) studied this question.
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