Question: What is the proper name for the steroid used by the retired British track sprinter who is one of the fastest European sprinters in the history of athletics?

Passages:
Richard Kilty (born 2 September 1989) is a British track and field sprinter who competes in the 60 metres, 100 metres and 200 metres.  His personal bests for the events are 6.49 seconds, 10.01 seconds and 20.34 seconds, respectively.  Coached for several years by 1992 Olympic 100 m champion Linford Christie, Kilty switched to Rana Reider in late 2013, when the American coach was recruited by UK Athletics.  He is the 2014 World, and 2015 and 2017 European Indoor 60m champion.  He also gained numerous British national sprint titles, including UK junior 100m champion and two-time English Schools national 100 metres champion, during his years at Northfield School and Sports College.  On the British club-level, he represents Gateshead Harriers, which is the major track club in his native northeast England. Somnus is a retired British champion Thoroughbred racehorse.  One of the best European two-year-olds in 2002, he developed into a leading sprinter the following year when he won the Group One Haydock Sprint Cup.  As a four-year-old he won two more Group One races in France- the Prix Maurice de Gheest (2004) and the Prix de la Forêt- and was named European Champion Sprinter at the Cartier Racing Awards.  He continued racing until being retired in 2008 at the age of eight, having won ten of his forty-three races.  Unlike many sprinters, Somnus was not a pure "speed horse" and ran only once, unsuccessfully, at five furlongs: all his victories came over six or seven furlongs. Edward W. "Dad" Moulton (1849 – July 19, 1922) was an American sprinter, athletic trainer, and coach.  He was a professional sprinter who won more than 300 races and was regarded as the American sprinting champion from 1872 to 1878.  Moulton later worked as a trainer of sprinters, wrestlers, boxers, and bicyclists.  He trained many well-known track and field athletes from the 1880s through the 1910s, including the original "world's fastest human," Al Tharnish, and Olympic medalists Alvin Kraenzlein (four gold medals in 1900), Charlie Paddock (two gold medals and one silver in 1920), Morris Kirksey (one gold and one silver in 1920), George Horine (bronze medal in 1912), and Feg Murray (bronze medal in 1920). Allan Wipper Wells (born 3 May 1952) is a former British track and field sprinter who became the 100 metres Olympic champion at the 1980 Summer Olympics in Moscow.  Within a fortnight of that, he also took on and beat America's best sprinters at an invitational meeting in Koblenz.  In 1981, Wells was both the IAAF Golden Sprints and IAAF World Cup gold medallist.  He is also a three-time European Cup gold medallist among many other sprint successes. Tetrahydrogestrinone (THG), often referred to by its nickname The Clear, is a synthetic, orally active anabolic-androgenic steroid (AAS) which was never marketed.  It was developed by Patrick Arnold and was used by a number of high-profile athletes such as Marion Jones and Dwain Chambers. Dwain Anthony Chambers (born 5 April 1978) is a retired British track sprinter.  He has won international medals at World and European level and is one of the fastest European sprinters in the history of athletics.  His primary event is the 100 metres, in which he has the fourth fastest time by a British sprinter.  He is the European record holder for the 60 metres and 4×100 metres relay events with 6.42 seconds and 37.73 s respectively.  He received a two-year athletics ban in 2003 after testing positive for THG, a banned performance-enhancing drug. Jana Kolukanova (born August 4, 1981) is a retired Estonian swimmer, who specialized in sprint freestyle events.  She is a two-time Olympian, multiple-times champion of Estonia and one of the top European sprinters of her generation. Stephen James Backley, OBE (born 12 February 1969) is a retired British track and field athlete who competed in the javelin throw.  He formerly held the world record, and his 91.46 m throw from 1992 is the British record.  During his career, he was a firm fixture in the British national athletics team.  He won four gold medals at the European Championships, three Commonwealth Games gold medals, two silvers and a bronze at the Olympic Games, and two silvers at the World Championships. Māsarjawaih (Arabic: ماسرجويه‎ ‎ ) was one of the earliest Jewish physicians of Persian origin, and the earliest translator from the Syriac; he lived in Basra about 683 (Anno Hegirae 64).  His name, distorted, has been transmitted in European sources; it has not yet been satisfactorily explained.  Neuda (in "Orient, Lit."  vi.  132) compares the name ""Masarjawaih"" with the Hebrew proper name ""Mesharsheya""; but the ending ""-waih"" points to a Persian origin.  The form ""Masarjis"" has been compared with the Christian proper name ""Mar Serjis""; but it is not known that Masarjis embraced either Christianity or Islam. In the philosophy of language a proper name, for example the names of persons or places, is a name which is ordinarily taken to uniquely identify its referent in the world.  As such it presents particular challenges for theories of meaning and it has become a central problem in analytical philosophy.  The common sense view was originally formulated by John Stuart Mill in "A System of Logic" where he defines it as "a word that answers the purpose of showing what thing it is that we are talking about but not of telling anything about it".  This view was criticized when philosophers applied principles of formal logic to linguistic propositions.  Gottlob Frege pointed out that proper names may apply to imaginary and inexistent entities without becoming meaningless, and he showed that sometimes more than one proper name may identify the same entity without having the same "sense", so that the phrase "Homer believed the morning star was the evening star" could be meaningful and not tautological in spite of the fact that the morning star and the evening star identifies the same referent.  This example became known as Frege's Puzzle and is a central issue in the theory of proper names.

Supporting sentences:
Tetrahydrogestrinone (THG), often referred to by its nickname The Clear, is a synthetic, orally active anabolic-androgenic steroid (AAS) which was never marketed. Dwain Anthony Chambers (born 5 April 1978) is a retired British track sprinter.  He has won international medals at World and European level and is one of the fastest European sprinters in the history of athletics.  He received a two-year athletics ban in 2003 after testing positive for THG, a banned performance-enhancing drug.