Orellanine is a toxic compound found in several mushroom species that can cause serious kidney damage and even death. In scientific and medical literature, several synonymous terms are used to refer to this poisonous substance including "amatoxin-group cyclopeptides," "orellanine-like compounds," and "dimethylhydrazines." Other common synonyms include "Orellin," "Orellanin," and "Orellanine HCl." It's important to be aware of these synonyms to ensure proper identification and treatment of mushroom poisoning caused by orellanine. As always, it's important to exercise caution when consuming any wild mushrooms and to consult with a trained mycologist or healthcare professional if you suspect you've ingested a toxic species.