Abstract Abundant labdatriene derivatives, named amberene [15,19,20-trinor-5,7,9-labdatriene (or 1,6-dimethyl-5-isopentyltetralin) (1)] and 1-methylamberene [15,20-dinor-5,7,9-labdatriene (or 1,1,6-trimethyl-5-isopentyltetralin) (2)] were isolated from the methanol extract of Kuji amber by HPLC. The structures were elucidated by spectral analyses including EIMS, 1D and 2D NMR and some previous assignments corrected.

中文翻译：

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Amberene 和 1-methylamberene，从 Kuji amber（日本）中分离和鉴定

摘要 丰富的labdatriene衍生物，命名为amberene [15,19,20-trinor-5,7,9-labdatriene (or 1,6-dimethyl-5-isopentyltetralin) (1)] 和 1-methylamberene [15,20-dinor- 5,7,9-labdatriene (或 1,1,6-trimethyl-5-isopentyltetralin) (2)] 用高效液相色谱法从久慈琥珀的甲醇提取物中分离出来。通过包括 EIMS、1D 和 2D NMR 在内的光谱分析阐明了结构，并修正了一些先前的分配。