The whole or part of a chain comprising one or more species of constitutional unit(s) in defined sequence.
Note:
Constitutional sequences comprising two constitutional units are termed diads, those comprising three constitutional units triads, and so on. In order of increasing @ST06775@ lengths they are called tetrads, pentads, hexads, heptads, octads, nonads, decads, undecads, etc.
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2299 (https://doi.org/10.1351/pac199668122287)