Two new naphthalene glucosides and other bioactive compounds from the carnivorous plant Nepenthes mirabilis

Two new naphthalene diglucosides named nepenthosides A (1) and B (2), together with eleven known compounds (3–13), were isolated from the carnivorous plant Nepenthes mirabilis. The structures of these compounds were elucidated based on extensive spectroscopic analysis, including 1D- and 2D-NMR, and MS. The antioxidant activities of compounds 1–13 were evaluated in terms of their peroxyl radical-scavenging (trolox equivalent, TE) and reducing...