68
derivatives (279, 280, and 306), six cacalol derivatives (322, 323, 332, 335, 547, and
548), bakkane (635), as well as two dimers (571 and 622). Compound 571 was named
virgaurin A [45], but the same name was already used in Refs. [12, 173]. Accordingly,
the name in Ref. [45] should be changed. Virgaurin C (622) is a dimer consisting of
cacalol-type and bicyclic compound units. Therefore, this sample was grouped as
H/C, a mixture of both types [45]. Sample 17 produced 6-acetoxyeuryopsyn (251),
neoadenostylone (283), and virgaurenone A (274) as major constituents, and this sample was grouped to the H/N/V type. Their derivatives, virgaurenone B (273), virgaurenospirolide B (639), 6β-acetoxyeremophil-1(10)-en-9-one (278), and
11βH-6β-acetoxy-7α,8α-epoxy-2-oxoeremophil-1(10)-en-12,8β-olide (531) were
Fig. 6 Noreremophilanes (1)
M. Tori and C. Kuroda
derivatives (279, 280, and 306), six cacalol derivatives (322, 323, 332, 335, 547, and
548), bakkane (635), as well as two dimers (571 and 622). Compound 571 was named
virgaurin A [45], but the same name was already used in Refs. [12, 173]. Accordingly,
the name in Ref. [45] should be changed. Virgaurin C (622) is a dimer consisting of
cacalol-type and bicyclic compound units. Therefore, this sample was grouped as
H/C, a mixture of both types [45]. Sample 17 produced 6-acetoxyeuryopsyn (251),
neoadenostylone (283), and virgaurenone A (274) as major constituents, and this sample was grouped to the H/N/V type. Their derivatives, virgaurenone B (273), virgaurenospirolide B (639), 6β-acetoxyeremophil-1(10)-en-9-one (278), and
11βH-6β-acetoxy-7α,8α-epoxy-2-oxoeremophil-1(10)-en-12,8β-olide (531) were
Fig. 6 Noreremophilanes (1)
M. Tori and C. Kuroda