24 (1R,5R)-1,5-epoxysalvial-4( 14)ene S. sclarea 49 2 salviadienol A S. chinensis 42 25 (2R,5E)-2,12-epoxycaryophyll-5ene S. sclarea 49 3 3β,6β,8a-triacetoxy-4β,5α-epoxy-1-oxogermacr-10(14)-ene S. roborowskii 43 26 (2R,5E)-caryophyll-5-en-12-al S. sclarea 49 4 3β,6β,8a-triacetoxy-4β,5α-epoxygermacr-1(10)E-ene S. roborowskii 43 27 (2S,5E)-caryophyll-5-en-12-al S. sclarea 49 5 3β,6β,8a-triacetoxy-4β,5α:1α,10β-diepoxygermacrane S. roborowskii 43 28 caryophyllene oxide S. sclarea 51, 47 6 salviadienol B S. chinensis 42 S. palaefolia 50 7 trijugin A S. trijuga 45 29 4,10-epoxy-6α-hydroxyguaiane (= buchariol) S. bucharica 343 8 trijugin B S. trijuga 45 30 isospathulenol S. sclarea 49 9 trijugin C S. trijuga 45 31 (1β,3β,4α,5α,6α,8α)-guai-10(14)ene-3,4,6,8-tetrol 3,6,8-triacetate S. roborowskii 48 10 trijugin D S. trijuga 45 32 spathulenol S. eupatorium 361 11 trijugin E S. trijuga 45 S. sclarea 51 12 trijugin F S. trijuga 45 33 nubiol S. nubicola 23 13 trijugin G S. trijuga 45 34 nubenolide S. nubicola 52 14 trijugin H S. trijuga 45 35 nubenolideacetate S. nubicola 52 15 trijugin I S. trijuga 45 36 bisnubidiol S. nubicola 23 16 (1aS*,6R*,6aS*,7aR*,9aR*)-1a,2,6,6a,7a,8,9,9a-octahydro-1a,5,7atrimethylbisoxireno[4,5:8,9]cyclodeca[1,2-b]furan-6-yl acetate (= castanin B) S. castanea 44 37 bisnubenolide S. nubicola 52 6-acetoxyglechomafuran S. roborowskii 43 38 1α,9β-dibenzoyloxy-2β,3β,4βtrihydroxydihydro-β-agarofuran S. palaefolia 50 17 glechomafuran S. palaefolia 47 39 lα-acetoxy-11-hydroxy-2,8-dioxoeudesman-3-en-12-oic acid methyl ester S. palaefolia 53 18 castanin C S. castanea 46 40 11-hydroxy-3,8-dioxo-eudesman-1,4-dien-12-oic acid methyl ester S. palaefolia 53 19 castanin D S. castanea 46 41 β-eudesmol S. microphylla 55 20 castanin E S. castanea 46 42 8α-hydroxy-β-eudesmol S. microphylla 55 21 castanin F S. castanea 46 43 1α-acetoxy-2-oxoeudesman-3,7(11)-dien-8β,12-olide S. palaefolia 53 22 (4R*,5R*,5aS*,8S*,8aR*,8bR*)-8-formyl-4,5,5a,6,7,8,8a,8b-octahydro-5,8b-dihydroxy-3,5a,8-trimethyl-2-oxo-2H-indeno[4,5-b]furan-4-yl acetate (= castanin A) S. castanea 44 44 1α-hydroxy-2-oxoeudesman-3,7(11)-dien-8β,12-olide S. palaefolia 53 23 (3β,4α,6α,8β,9β,10α)-8-(acetyloxy)-3,4:9,10-diepoxygermacr-7(11)-eno-12,6-lactone S. roborowskii 48 45 1α,8α-dihydroxy-2-oxoeudesman-3,7(11)-dien-8β,12-olide S. palaefolia 53, 54 46 1α-acetoxy-8α-hydroxy-2oxoeudesman-3,7(11)-dien-8,12olide S. palaefolia 54

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Two tetranortriterpenoids with new skeletons, xylomexicanins I and J (1 and 2), were isolated during the investigation of chemical constituents from seeds of the Chinese mangrove, Xylocarpus granatum. Xylomexicanin I (1) is an unprecedented limonoid with bridged B- and C-rings. A biosynthesis pathway for 1 from xylomexicanin F is proposed.

Ten 1,10-secoguaianolides were isolated from the flowers of Achillea millefolium. Their structures were determined on the basis of spectroscopic methods. Three of them (millifolides A-C) including two dimeric sesquiterpenoids exhibit new skeletons. Seco-tanapartholide A exhibited moderate cell growth inhibitory activity against the human cancer cell line MCF7WT (IC 50 = 5.51 µm) in vitro.