intramolecular

https://doi.org/10.1351/goldbook.I03130
  1. Descriptive of any process that involves a transfer (of atoms, groups, electrons, etc.) or interactions between different parts of the same molecular entity.
  2. Relating to a comparison between atoms or groups within the same molecular entity.
See also: intermolecular
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1126 (https://doi.org/10.1351/pac199466051077)