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Eleven new secoiridoid aglycones involving unusual C 9 -skeleton: swerimilegenins A-F ( 1 – 6 ); bis-C9-skeleton: swerimilegenin G ( 7 ); and C 10 -skeleton: swerimilegenins H-K ( 8 – 11 ), as well as six known ones, were isolated from the low-polarity part of the traditional Chinese herb medicine  Swertia mileensis . Their structures were determined by extensive spectroscopic data and X-ray diffraction. Biogenetically, swerimilegenin A ( 1 ) belonged to 10-nor-secoiridoid, and swerimilegenins B-F ( 2 – 6 ) were 1-nor-secoiridoids. Erythrocentaurin ( 12 ) and gentiogenal ( 15 ) showed moderate anti-HBV activity on HepG 2.2.15 cell line  in vitro .Electronic Supplementary Material  Supplementary material is available for this article at 10.1007/s13659-013-0059-y and is accessible for authorized users.

Minor secoiridoid aglycones from the low-polarity part of the traditional Chinese herb: Swertia mileensis