ortho
-fused (polycyclic compounds)
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https://doi.org/10.1351/goldbook.O04335
Polycyclic compounds in which two rings have two, and only two, atoms in common. Such compounds have
n
common faces and 2
n
common atoms. Examples:
O04335.png
Source:
Blue Book, p. 22 (https://www.acdlabs.com/iupac/nomenclature/)