Bone_break_bond [id 2 atoms]
Break all bonds between 2 identified atoms. The 2 atoms must not form a closed connection. The new connectivity must be saved by the user with Save_DB or Stop. Do not make a lot of changes without hitting Save_DB. Note that there is no specific 'undo' command for this operation. The user might instead want to use the following 2 macros
!bond_break macro copy save_connectivity skel_connectivity bon_break
to break the bonds and
! bond_undo macro copy skel_connectivity save_connectivity
to undo the act if a mistake was made. In both macros, it is assumed that the skeleton molecule is called skel. After calling the undo macro, merely make the affected objects again.