long chain

https://doi.org/10.1351/goldbook.L03619
A chain of high relative molecular mass.
See: macromolecule (Note 1)
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2294 (https://doi.org/10.1351/pac199668122287)