Herbs that Transform Phlegm and Stop Coughing

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Which herb unbinds the chest and disperses clumping, treating stifling sensation in the chest, constriction, pain, or pressure ?
Gua Lou transforms phlegm-heat and unbinds the chest. This is used in formulas like Xiao Xian Xiong Tang (Minor Sinking into the Chest Decoction) and Gua Lou Xie Bai Bai Jiu Tang (Trichosanthis, Chinese Chive, and White Wine Decoction).

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 384 [Q843]