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Alkaloids (3)
Cyclic compounds (3)
Cycloalkanes (3)
Cyclopentanes (3)
Five-membered rings (3)
Pyrroles (3)

Ryania (15662-33-6)  
Ryanodine is a poisonous diterpenoid found in the South American plant Ryania speciosa (Salicaceae). It was originally used as an insecticide. The compound has extremely high affinity to the open-form ryanodine receptor, a group of calcium channels found in skeletal muscle, smooth muscle, and heart muscle cells.