... University of Pittsburgh, Pittsburgh, PA 15260 USA. Richard G. Ball. Merck Sharp & Dohme Research Laboratories, PO Box 2000, Rahway, NJ 07065 USA. Received 26 June 1990, Available online 5 March 2001. Abstract. An unusual fragmentation reaction that affords a carbamoyl anion discovered during the course of the synthesis of rigidified PCP analogues is reported. ... References. 1; a AP Kozikowski, Y.-P. Pang; Molecular Pharmacology, 37 (1990), p. 352. ...