Talk:Hantzsch–Widman nomenclature

mancude ring system
Who can explain what non-cumulated double bonds are? Simon de Danser (talk) 17:37, 15 May 2017 (UTC)

Skeletal replacement names
This is a different system, and differs from Hantzsch-Widman in a few cases (aluma, indiga). Double sharp (talk) 09:55, 24 July 2016 (UTC)