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Matsuda, H.; Shimoda, H.; Yamahara, J.; Yoshikawa, M. (1998). "Immunomodulatory activity of thunberginol a and related compounds isolated from hydrangeae dulcis folium on splenocyte proliferation activated by mitogens". Bioorganic & Medicinal Chemistry Letters. 8 (3): 215–20. doi:10.1016/S0960-894X(97)10221-9. PMID9871657.