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In this report, a new cytotoxic group, a 15-oxo-16α-H-17-methoxy (or ethoxy)- unit, was suggested from the structure-activity relationship analyses of 39 ent-kaurane diterpenoids, including 17 new compounds (neolaxiflorins I–Y, 1–17) isolated from the leaves of Isodon eriocalyx var. laxiflora using an in vitro cytotoxicity assay against HL-60, SMMC-7721, A-549, MCF-7, and SW-480 human cancer cell...
Twenty nine 6,7-seco-ent-kaurane-type diterpenoids including 18 new ones, laxiflorolides C–T (1–18), along with 21 known ones were obtained from Isodon eriocalyx var. laxiflora. Laxiflorolides E–G (3–5) are the first identified naturally occurring 6,7-seco-ent-kauranoids that feature a 3,6-epoxy unit, and laxiflorolide M (11) is the first identified naturally occurring 6-nor-6,7-seco-ent-kauranoid...
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