Tatsuhiko Nakano et al.
Rearrangements of Derivatives of Methyl 9,11-Dihydroxy-(-)-Kauran-19-Oate to New Skeletal Diterpenes
Natural Product Research, Volume 1, Issue 4 February 1993 , pages 257 - 262
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http://dx.doi.org/10.1080/10575639308050057