has part has role independent continuant beta-adrenergic agonist organic molecular entity racemate diastereoisomeric mixture ractopamine CHEBI:82644 A diastereoisomeric mixture of approximately equal amounts of all four possible diastereoisomers of 4-(1-hydroxy-2-{[4-(4-hydroxyphenyl)butan-2-yl]amino}ethyl)phenol. A β-adrenergic agonist, it is used (generally as the hydrochloride salt) as a feed additive for use in pigs and other livestock to promote protein deposition, resulting in leaner meat. The <i>R</i>,<i>R</i> diastereoisomer, butopamine, is responsible for most of the leanness-enhancing effects. While use of ractopamine has been banned in over 120 countries including throughout the EU, in the US it used in an estimated 80% of all beef, pork and turkey production. butopamine ent-butopamine 4-[(1S)-1-hydroxy-2-{[(2R)-4-(4-hydroxyphenyl)butan-2-yl]amino}ethyl]phenol 4-[(1R)-1-hydroxy-2-{[(2S)-4-(4-hydroxyphenyl)butan-2-yl]amino}ethyl]phenol animal growth promotant