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Two new, 16-oxo-leoheteronone A (1) and 15-methoxyleoheteronin B (2), and four known, 8,9-secohispanolone (3), galeopsin (4), hispanone (5), and leoheteronin B (6), labdane diterpenoids were isolated from the aerial parts of Leonurus japonicus. Compound 3 was isolated for the first time as a naturally occurring compound. Structures of the two compounds were determined on the basis of extensive spectroscopic...
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