SCHEME 8.
Total synthesis of dl-shikonin. 3: 1,4-dimethoxy-5-hydroxy naphthalene skeleton, 4: naphthol skeleton, 5: aldehyde, 6: 1,4-bismethoxy-5-hydroxynaphthalene epoxides, 7: naphthol skeleton, 8: dl-shikonin (Lu et al., 2008).
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