damn, JWK beat me. haha
My first guess was "a cleaner more efficient source of fuel"
but yes its generic Enflurane (Ethrane)
I found a site that will help with nomenclature.
Enflurane is an isomer so the chemical structure is somewhat pliable.
It is an anesthetic with a fast onset and metabolism generally used for induction of "sleep" prior to surgery. It is used in Obstetrics for analgesia during vaginal delivery. Today Isoflurane is primarily used due to the observation of "eliptiform" wave activity on EEG seen with Enflurane.
Ether or sweet oil was discovered by Spanish chemist, Raymundus Lullius in 1275. In 1540 German Scientist, Valerius Cordus described how to synthesize it and Swiss physician, Paracelsus discovered the medicinal uses of ether.
For more information go to Vanderbilt: http://18.104.22.168/search?q=cache:y3HiffJH8gwJ:www.safety.vanderbilt.edu/pdf/hcs_msds/enflurane_ethrane.pdf+enflurane+indications&hl=en&gl=us&ct=clnk&cd=3