valence isomer

https://doi.org/10.1351/goldbook.V06590
A constitutional @I03289@ interrelated with another by @P04491@. For example, Dewar benzene, prismane and benzvalene are @V06588@ isomers of benzene.
See:
tautomerism
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1175 [Terms] [Paper]