Awale, Suresh; Tezuka, Yasuhiro; Banskota, Arjun H.; Kouda, Kyoji; Tun, Kyaw Myint; Kadota, Shigetoshi.Four highly oxygenated isopimarane-type diterpenes of Orthosiphon stamineus. Planta Medica(2002),68(3),286-288.CODEN: PLMEAAISSN:0032-0943.CAN 137:179504AN 2002:284104 CAPLUS