mechanically-interlocked molecular architectures . In 1997,  biologists   Chengde Mao  and coworkers of  New York University  succeeded in constructing  molecular Borromean rings  from  DNA ( Nature , volume 386, page 137, March 1997). In 2003,  chemist   Fraser Stoddart  and coworkers at  UCLA  utilised  coordination chemistry  to construct  molecular Borromean rings