The "Social - Chemistry" of Pharmacological Discovery. The Enkephalin Story. An Interview with Professor Hans W. Kosterlitz 'The "Social - Chemistry" of Pharmacological Discovery. The Enkephalin Story. An Interview with Professor Hans W. Kosterlitz', reprinted from 'Social Pharmacology', 2 (1988), 97 - 112. The interview was made January 20 1986 at Marischal College, Aberdeen, Scotland. 1988