Abstract
Six new triterpenoids, pseudolarins A–F (1–6), were isolated from the twigs of Pseudolarix amabilis, together with four known triterpenoids (7–10) and five known diterpenoids (11–15). Their structures were determined by extensive spectroscopic analysis, and the absolute configuration of 1 was assigned by single-crystal X-ray diffraction. Compound 1 is a 3,4:9,10-diseco-cycloartane triterpenoid possessing an unprecedented 5/5/7/6/5/6/5 ring system. Compounds 1, 5, 7, 9–11, and 13 showed inhibition against protein tyrosine phosphatase 1B (PTP1B) in vitro.
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