Kairine is a derivative of tetrahydroquinoline which was first described by Wilhelm Fischer in 1883. Its name comes from the Greek kairos, meaning "the right time". It is an antipyretic, formerly used against typhoid fever, but now largely obsolete due to severe side effects. Both kairine and its N-ethyl homolog show similar antipyretic activity.
Loch Katrine (listen ; Scottish Gaelic: Loch Ceiteirein [l̪ˠɔx ˈkʲʰeʰtʲɪɾʲɛɲ ] or Loch Ceathairne) is a freshwater loch and scenic attraction in the Trossachs area of the Scottish Highlands. It is within the historic county and registration county of Perthshire and the district of Stirling. The loch is 13 kilometres (8.1 mi) long and 1 kilometre (0.62 mi) wide at the widest point and runs the length of Strath Gartney (Gaelic: Srath Ghartain). It is a popular destination for tourists and day visitors from Glasgow and nearby towns. The loch derives its name from the term cateran from the Gaelic ceathairne, a collective word meaning cattle thief or possibly peasantry. Historically this referred to a band of fighting men of a clan; hence the term applied to marauders or cattle-lifters, which Rob Roy MacGregor, a respectable cattle owner was erroneously accused of being.