Isolation of Picropolygamain from the Resin of Bursera simaruba

Isolation of Picropolygamain from the Resin of Bursera simaruba A New Antimalarial Quassinoid from Simaba guianensis Diterpenoids and Triterpenoids from the Resin of <i>Bursera microphylla</i> and Their Cytotoxic Activity Constituents of the Twigs of Hernandia ovigera that Inhibit the Transformation of JB6 Murine Epidermal Cells Melanogenesis Stimulation in Murine B16 Melanoma Cells by Piper nigrum Leaf Extract and Its Lignan Constituents Bis-5-alkylresorcinols from <i>Panopsis </i><i>r</i><i>ubescens</i> that Inhibit DNA Polymerase β Benzofuranoid neolignans from Aniba simulans Inhibitory Activity against Tobacco Mosaic Virus (TMV) Replication of Pinoresinol and Syringaresinol Lignans and Their Glycosides from the Root of <i>Rhus javanica</i> var. <i>roxburghiana</i> Studies on the constituents of Picrasma quassioides BENNET. III. The alkaloidal constituents. Studies on the alkaloids from Picrasma quassioides BENNET. IX. Structures of two .BETA.-carboline dimeric alkaloids, picrasidines-G and -S.