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从杉科植物杉木Cunninghamialanceolata的根皮中分得3种半日花烷型（Labdan）二萜类成分。经理化常数和波谱分析，分别鉴定为12，13E－biformen（Ⅰ），12，13E－ozicacid（Ⅱ）和12，13E－methylozate（Ⅲ），均为首次从该植物中分得。
Three kinds of diterpenoids of Labdan type were obtained from the root barks of the Cunninghamia lanceolata plant of Cunninghamia lanceolata. The managerial constants and spectral analysis were identified as 12,13E-biformen (I), 12,13E-ozicacid (II) and 12,13E-methylozate (III), respectively, which were all isolated from the plant.