BIOACTIVATION OF THE 3-AMINO-6-CHLOROPYRAZINONE RING IN A THROMBIN INHIBITOR LEADS TO NOVEL DIHYDRO-IMIDAZOLE AND IMIDAZOLIDINE DERIVATIVES: STRUCTURES AND MECHANISM USING 13C-LABELS, MASS SPECTROMETRY, AND NMRRaju Subramanian, Rominder Singh, Jonathan Z. Ho et al.|Drug Metabolism and Disposition|2003Cited by 11