One aspect of the present invention relates to diazabicyclo[4.3.0]nonanes.
A second aspect of the present invention relates to the use of the
diazabicyclo[4.3.0]nonanes as ligands for various cellular receptors,
including opiate receptors. An additional aspect of the present invention
relates to the use of the diazabicyclo[4.3.0]nonanes as analgesics.