descocin dexawin dextrosulfenidol dextrosulphenidol efnicol fricol hyrazin igralin macphenicol masatirin neomyson racefenicol racefenicolo racefenicolum raceophenidol racephenicol rincrol thiamcol thiamphenicol epimer thiamphenicolum thiocymetin thiomycetin thiophenicol tiamfenicol tiamfenicolo urfamicina urfamycine urophenyl vicemycetin