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Only protopine and d-stylopine have been isolated in amount sufficient for identification from Corydalis cornuta. Though closely related taxonomically to C. sibirica and C. ochotensis only the presence of acetyl-ornithine confirms this similarity. It is suggested that C. ochotensis is a polyploid form of C. cornuta.
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Richard H. F. Manske (1946) studied this question.
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