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piper crassinervium/seenevastane

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Antifungal flavanones and prenylated hydroquinones from Piper crassinervium Kunth.

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Bioactivity-guided fractionation of the EtOAc extract from leaves of Piper crassinervium yielded three prenylated hydroquinones together with two known flavanones naringenin and sakuranetin. Their structures were determined by means of spectroscopic analysis (NMR, IR, UV and MS) including
A new antifungal piperidone derivative 3alpha,4alpha-epoxy-2-piperidone, whose structure was determined by spectroscopic methods, was isolated from the MeOH extract from leaves of Piper crassinervium. This is the first occurrence of one amide in P. crassinervium.

Synthesis and structure-activity relationships of antifungal crassinervic acid analogs.

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A series of analogs of the natural antifungal compound crassinervic acid, a constituent of Piper crassinervium, were synthesized to gain insight into the most relevant structural features affecting the activity of the parent molecule. Most compounds were prepared by aldol reaction of methyl
Piper crassinervium, P. aduncum, P. hostmannianum, and P. gaudichaudianum contain the new benzoic acid derivatives crassinervic acid (1), aduncumene (8), hostmaniane (18), and gaudichaudianic acid (20), respectively, as major secondary metabolites. Additionally, 19 known compounds such as benzoic
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