One new long-chain ester derivative of trans-ferulic acid and one natural tirucallane-type triterpenoid , together with forty known compounds (), were isolated from the barks of . Their structures were established on the basis of spectroscopic data interpretation. Compounds , , , , showed significant inhibitory activities against PTP1B with IC values of 13.82 ± 1.29 μM, 13.29 ± 2.26 μM, 20.27 ± 0.52 μM, 24.36 ± 1.25 μM, 15.23 ± 0.6 μM, respectively.
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