pharmacognosy phytochemistry isolation extraction identification uses terpenoids thea sinensis rauwolfia serpentina reserpine caffeine chjaraterization quinine atropine characterization artimisnin citral menthol analysis podophyllotoxin resin rutin glycyrrhetinic acid glycyrrhiza glabra glycosides docetaxel paclitaxel taxus artemisia gentian root iridoids naphthaquinones
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