Roscotanes and roscoranes: Oxygenated abietane and pimarane diterpenoids from Kaempferia roscoeana

The oxygenated abietanes, roscotanes A-D, and oxygenated pimaranes, roscoranes A-D, along with twelve known diterpenoids were isolated from Kaempferia roscoeana. Their structures were elucidated using various spectroscopic techniques.196