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Di Long or Dilong extract (Chinese: 地龍散; pinyin: dìlóngsàn; Wade–Giles: ti-lung san; lit. 'earth-dragon/-worm powder') is a medicinal preparation based on abdominal extracts from the earthworm species Lumbricus rubellus used in traditional Chinese medicine (TCM) for a wide variety of disorders, from convulsions and fevers to rheumatoid arthritis and blood stasis syndromes.