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The value that should be taken as the target for the chemical
bond associated with the specified atoms, expressed as a bond
order.
| Item Value | Description |
|---|---|
| sing | single bond |
| doub | double bond |
| trip | triple bond |
| quad | quadruple bond |
| arom | aromatic bond |
| poly | polymeric bond |
| delo | delocalized double bond |
| pi | pi bond |