::   I infer that the (C) portions refer to side chains, and don't see an 8th structure, tho i won't claim my failure proves anything. (Oh wait a minit - hmm, no, that one's redundant.)   I'll copy this section to talk:pentyl, and strike it thru here.•  

 == Breakup == 
    The only sign of a core topic is the etymological relationships, and since NAD this is not a term that (like Fuck and Nigger) has aspects justifying an etymology-/usage-focused article. The title should become a Dab, and the sections become Dab-entries and in some cases stubs.•