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Classes of Secondary Metabolites Standards Revealing Agent Intensity Alkaloids Flavonoids Lignans Mono, sesqui and diterpenes Naphthoquinones Saponins Hydrolysable tannins Triterpenes and steroids Yohimbine Quercetin - - - Saponin Gallic acid - Dragendorff NP/PEG Vanillin phosphoric Vanillin sulphuric 10% ...