3-pole
3-position
4-acetyl-6-tert-butyl-1
4'-diisocyanate
4-dioxane
4fo
4-strand
5-acetyl-1
5-trimethylcyclohexanol-1
6-acetyl-1
  6-dimethyl-4-heptanol
6-dimethylmorpholine
6-hexamethyl
90-degree
a
AA
A-B
ab
abac
abaca
aback