Abstract
The ethyl acetate extract of the aerial parts of Ajuga turkestanica afforded 6 neo-clerodane diterpenes, including two novel compounds, 14,15-dihydroajugachin B ( 1) and 14-hydro-15-methoxyajugachin B ( 2), in addition to the known diterpenoids chamaepitin ( 3), ajugachin B ( 4), ajugapitin ( 5) and lupulin A ( 6). Structures were established through exhaustive NMR spectroscopic analysis and chemical transformation in the case of 1. The full 1H and 13C NMR assignment of the C-15 R and S configurations of 14-hydro-15-methoxyajugachin B and chamaepitin were elucidated.
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