The id of the second of the two atoms that define the bond.
As this data item does not point to a specific atom in a
specific component, it is not a child in the linkage sense.
This HTML dictionary was created using the CIFLIB C Language Application Program Interface
at the
Resource Collaboratory for Structural Bioinformatics
Rutgers University, Department of Chemistry
New Brunswick, New Jersey help@rcsb.rutgers.edu