Contents

01 December 1995
Vol 270, Issue 5241

About The Cover

Tetramethyladamantane (green) is encapsulated by two molecules of a self-complementary synthetic receptor. An array of weak intermolecular forces are balanced to produce the assembly in solution. (Red spheres, oxygen atoms; blue spheres, nitrogen atoms.) See 1485. [Image: Michael Pique, The Scripps Research Institute, on a Sun Workstation with software by Michael Connolly and AVS, Inc.]