Mynoquintistrycnite was a type of medicinal tranquilizer available to Starfleet in the 23rd century.
History and specifics[]
In the year 2270, Dr. Leonard McCoy loaded his hypospray with a high dose of mynoquintistrycnite so that Captain James T. Kirk could knock out a loose Capellan power cat aboard Kukulkan's starship. McCoy commented that the sedative was strong enough for a hippopotamus herd. (TAS - Log Six novelization: How Sharper Than a Serpent's Tooth)