title: Isolation and identification of impurities in L-696, 229 drug substance.
abstract: Two low level impurities in 3-[2-(2-benzoxazolyl)ethyl]-5-ethyl-6-methyl-2(1H)-pyridinone drug substance (L-696,229) have been isolated by a combination of preparative HPLC, solid-phase extraction and liquid-liquid extraction. They were identified as 3-[2-(2-benzoxazolyl)ethyl]-5-ethyl-6-(2-phenylethyl)-2(1H)-pyridinone (I) and 6,6'-(2-phenyl-1,3-propanediyl)bis[3-[2-(2-benzoxazolyl)ethyl]-5-ethyl-2(1H)-pyridinone] (II) by mass spectrometry and by their (13)C and (1)H-NMR spectra.
authors.affiliation: Merck Research Laboratories, P.O. Box 2000, Rahway, NJ 07065-0900, U.S.A.
authors.forename: S V
authors.initials: SV
authors.lastname: Prabhu
authors.forename: J M
authors.initials: JM
authors.lastname: Ballard
authors.forename: R A
authors.initials: RA
authors.lastname: Reamer
authors.forename: D K
authors.initials: DK
authors.lastname: Ellison