1. Kapoor M, Shaw O, Appleton I (2005) Possible anti-inflammatory role of COX-2-derived prostaglandins: implications for inflammation research. Curr Opin Investig Drugs (Thomson Scientific) 6:461–466
2. Namba T (1980) Coloured illustrations of wakan-yaku. Hoikusya publishing Co. Ltd., Hoikusya
3. Morimoto I, Kishi T, Ikegami S, Hirata Y (1965) Naphthoquinone derivatives from Lithospermum erythrorhizon. Tetrahedron Lett 4737–4739
4. Morimoto I, Hirata Y (1966) Naphthoquinone derivatives from Lithospermum erythrorhizon. Tetrahedron Lett 3677–3680
5. Kyogoku K, Terayama H, Tachi Y, Suzuki T, Komatsu M (1973) Constituents of shikon I. Structure of three new shikonin derivatives and isolation of anhydroalkannin. Shoyakugaku Zasshi 27:24–30