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Terpenes U 0200 Lanostane-Type Triterpenoids from the Sclerotia of Inonotus obliquus Possessing Antitumor Promoting Activity. -(TAJI, S.; YAMADA, T.; WADA, S.-I.; TOKUDA, H.; SAKUMA, K.; TANAKA*, R.; Eur.

Three new lanostane‐type triterpenoids, inonotsulides A, B, and C (1–3, resp.) were isolated from the sclerotia of Inonotus obliquus (Pers.: Fr.) (Japanese name: Kabanoanatake; Russian name: Chaga). Their structures were determined to be (20R,24S)‐3β,25‐dihydroxylanost‐8‐en‐20,24‐olide (1), (20R,24R)‐3β,25‐dihydroxylanost‐8‐en‐20,24‐olide (2), and (20R,24S)‐3β,25‐dihydroxylanosta‐7,9(11)‐dien‐20,24‐olide (3) on the basis of chemical transformation, NMR spectroscopy including 1D and 2D (1H,1H‐COSY, NOESY, HMQC, HMBC), EI‐MS, and single‐crystal X‐ray analysis.