Substances
Matrix
Comments
Oleoylethanolamine (OEA)
Omeprazole (Esomeprazole)
Orellanine
Orphenadrine
Oxazepam
Oxytetracycline
mouse plasma and cell culture media
human plasma, serum, dog plasma, serum
human plasma, rat plasma, mouse plasma, dog plasma
rat serum
plasma, urine
milk replacer