Mapenterol is an agonist of β2-adrenergic receptors (β2-ARs).1 It has been used as a standard for the simultaneous detection of multiple drug residues in commercial livestock synovial fluids by GC-MS.2 It has been used as an illicit feed additive to promote growth in livestock.1
1.Boyd, S., Heskamp, H.H., Bovee, T.F.H., et al.Development, validation and implementation of a receptor based bioassay capable of detecting a broad range of beta-agonist drugs in animal feedingstuffsAnal. Chim. Acta637(1-2)24-32(2009) 2.Brambilla, G., Civitareale, C., Pierdominici, E., et al.Synovial fluid as a matrix of selection in the detection of beta-adrenergic agonist drugs in carcases and fresh meatAnalyst119(12)2591-2593(1994)