Hyronalin was a drug used to treat radiation poisoning, used during the 23rd and 24th centuries. It had been a standard treatment for radiation poisoning since the late 2100s. (TOS episode: "The Deadly Years", ST website: Startrek.com) Hyronalin can be derived from the exoskeleton of the Alverian dung beetle. (ST reference: Creatures) A hyronalin derivative was used by Federation sociological observers on planet NGC 667 due to the degree of naturally occuring radiation on that world. (TOS short story: "First, Do No Harm")