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Romanova, A.S., Tareeva, N.V. & Ban'kovskii, A.I. Isolation of shikonin fromOnosma caucasicum andEchium rubrum . Chem Nat Compd 3, 60 (1967). https://doi.org/10.1007/BF01171741
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DOI: https://doi.org/10.1007/BF01171741