Affiliation:
1. National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
Abstract
Two new diterpenoids, maoyecrystal J (1) and maoyecrystal K (2), together with five known diterpenoids, effusanin A (3), isodonal (4), isodonoiol (5), rabdosinate (6) and rabdosin B (7) were isolated from Isodon japonica (Burman f.) Hara. The structures of the two new compounds were assigned 1α,6β,7β-trihydroxy-7α,20-epoxy- ent-kaur-11(12),16(17)-dien-15-one (1) and 6β,11α-dihydroxy-16β-methoxymethyl-6,20-epoxy-6,7- seco-ent-kaur-15-one-1α, 7-olide (2) on the basis of HR–MS, 1H, 13C and 2D NMR spectroscopic methods.
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