Developed in 1982 by
天津第六中药厂 (Tianjin No. 6 TCM Factory). Tiny brown pills containing
川芎 (chuānxiōng) and
冰片 (bīngpiàn, borneol), taken sublingually for angina. A staple in many older Chinese people's pockets — the Chinese answer to nitroglycerin tablets.