Bridge is an unbranched chain of atoms or an atom or a covalent bond connecting two bridgeheads in a policyclic compound.
The main bridge is a bridge which connects the two main bridgeheads.
A secondary bridge is any bridge not included in the main ring or the main bridge.
An independent secondary bridge links bridgeheads which are part of the main ring or main bridge.
A dependent secondary bridge links at least one bridgehead which is part of a secondary bridge.
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