Abstract
Phytochemical investigation on the whole plant of Chloranthus japonicus (Chloranthaceae) led to the isolation and identification of three new lindenane-type sesquiterpenoid dimers, chlorajaponilides F–H (1–3), along with seven known ones (4–10). Their chemical structures were established by extensive spectral evidence. Compounds 1 and 2 are both dimeric sesquiterpenoids featuring a rare hydroperoxy group at C-5. All compounds were tested for their activities on wild type HIV-1 replication and compounds 1, 2, 5, and 9 were effective with EC50 values from 3.08 to 17.16μM. All these four compounds showed the same inhibitory effects on the two NNRTI-resistant HIV strains as on wild-type HIV-1 with EC50 change folds from 0.61 to 1.6μM. Furthermore, compounds 1, 5, and 9 exhibited inhibitory activities on HCV replication with the similar potency as their activities on HIV-1. Our finding may provide a clue to address the problem of HIV-1 and HCV co-infection.
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