It is a kind of alkaloid extracted from water moccasin, which was used as a drug to prevent rejection of allogeneic transplanted organs, but was found to have a strong carcinogenic effect on the human body, so its use was stopped.　The maximum clinical use level is 0.5 grams, and exceeding this level can cause serious damage to multiple organs. Three to four times the maximum clinical use can be fatal, and the symptoms are extremely similar to those of bacillary dysentery, which cannot be distinguished by the naked eye alone.　

The movie "No Trace Forensics" is a movie dedicated to this drug.