Guaifenesin
(重定向自Glyceryl guaiacolate)

Guaifenesin INN /ɡwaɪˈfɛnᵻsɪn/ or guaiphenesin (former BAN), also glyceryl guaiacolate, is an expectorant drug sold over the counter and usually taken orally to assist the bringing up (expectoration) of phlegm from the airways in acute respiratory tract infections.