21 new compounds are isolated, two of them are bakkane‐type sesquiterpenoids bearing an anhydride‐type ring C [(I,II) named virgaureno‐anhydride A and B] which is a previously unknown partial structure.

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Chemical Constituents. -21 new compounds are isolated, two of them are bakkane-type sesquiterpenoids bearing an anhydride-type ring C [(I,II) named virgaureno-anhydride A and B] which is a previously unknown partial structure. Furthermore, three virgaurenospirolides (IIIa-c), four virgaurenolidols A-D (IVa-d), three virgaurenolides C-E (Va-c), five epoxy-lactones (VIa-d, VII), three lactones (VIIIa-c), and an enedione (IX) are isolated and structurally investigated for the first time. -(SAITO, Y.; IGA, S.; NAKASHIMA, K.; OKAMOTO, Y.; GONG, X.; KURODA, C.; TORI*, M.; Tetrahedron 71 (2015) 44, 8428-8435, http://dx.