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A few reviews on the phytochemistry, biology, toxicology, and pharmacology of the Zingiber and Alpinia genus have been published recently (Zhang et al., 2016

Different mediators can elicit distinct physiological responses in the surrounding tissue

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Still, it is inconvenient with a regular series of molecules like amino acids and simple sugars." If you are told to draw the correct stereochemistry of a molecule with one chiral C (S isomer, for example) and are given the substituents, you could do so easily following the R, S priority rules