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Boonsombat, J.; Mahidol, C.; Chawengrum, P.; Reuk-ngam, N.; Chimnoi, N.; Techasakul, S.; Ruchirawat, S.; Thongnest, S. Roscotanes and Roscoranes: Oxygenated Abietane and Pimarane Diterpenoids from Kaempferia roscoeana. Phytochemistry 2017, 143, 36-44.