skeletal structure

https://doi.org/10.1351/goldbook.S05708
The @ST06775@ of atoms in the @C01288@ of a @M03667@, an @O04286@, a @B00682@ or a @C00946@ which defines the essential topological representation.
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2296 [Terms] [Paper]