Herbs that Regulate Qi

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In moving qi, what is the specialty of Tan Xiang (santali albi lignum)?
Tan Xiang unblocks qi in the chest. It shows up in one formula for chest pain (Dan Shen Yin).

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 539 [Q877]