title: Gas chromatographic negative ion mass spectrometric assay of 2-dicyclopropylmethylamino-2-oxazoline (S-3341), a new antihypertensive drug.
abstract: The quantification in plasma and urine of 2-dicyclopropylmethylamino-2-oxazoline (S-3341), a new antihypertensive drug is described using a sensitive gas chromatographic negative ion mass spectrometric method with ammonia as moderating gas. After a two-step extraction, derivatization is carried out with 3,5-bis(trifluoromethyl)benzoyl chloride and the abundance of the molecular ion (m/z 420) obtained is compared with that of the tetradeuterated standard (m/z 424). The low background due to the high mass and negative ion detection provides a detection limit of about 1 pg per injection. Oral administration of 1 or 2 mg S-3341 to patients gives a maximum concentration of 3.3 +/- 0.7 ng ml-1 and 7.6 +/- 2.0 ng ml-1 at 1.8 +/- 0.6 h and 1.4 +/- 0.7 h and an average elimination half-life of 6.7 h.
authors.forename: J D
authors.initials: JD
authors.lastname: Ehrhardt
mesh_terms: D000316:Adrenergic alpha-Agonists / Q000032:analysis* / Q000097:blood / Q000652:urine; D000959:Antihypertensive Agents / Q000032:analysis* / Q000097:blood / Q000652:urine; D055598:Chemical Phenomena; D002621:Chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007700:Kinetics; D010080:Oxazoles / Q000032:analysis* / Q000097:blood / Q000652:urine; D000077769:Rilmenidine
chemical_list: D000316:Adrenergic alpha-Agonists; D000959:Antihypertensive Agents; D010080:Oxazoles; D000077769:Rilmenidine