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Three new cassane-type diterpenoids, namely, (4 S )-6 β ,12 α ,19-trihydroxy-cass-13(15)-en-16,12-olide ( 1 ), cass-13(15)-en-​16,12-olide ( 2 ), and 12 α -hydroxy-cass-13(15)-en-16,12-olide ( 3 ), were isolated from the seeds of  Caesalpinia  sinensis. The structures of  1 – 3  were established by extensive spectroscopic analysis, and their absolute configurations were assigned by electronic circular dichroism (ECD) calculations. The inhibitory activities against PTP1B of the isolated compounds were evaluated. The results showed that compound  2  possessed PTP1B inhibitory activity with an IC 50  value of 217.45 ± 36.4 μM.

Three new cassane-type diterpenoids from Caesalpinia sinensis