(R*,S*)-(1)-8-Hydroxy-5-(1-hydroxy-2-(isopropylamino)butyl)quinolin-2(1H)-one monohydrochloride 2(1H)-Quinolinone, 8-hydroxy-5-(1-hydroxy-2-((1-methylethyl)amino)butyl)-, monohydrochloride, (R*,S*)-(+-)- 5-(1-Hydroxy-2-isopropylamino)butyl-8-hydroxycarbostyril hydrochloride 62929-91-3 72332-33-3 EINECS 263-763-0 Meptin OPC 2009 Procaterol hydrochloride