heteropolysaccharide (heteroglycan)

https://doi.org/10.1351/goldbook.H02812
The class name for polysaccharides composed of two or more different kinds of monomeric units (i.e. monosaccharides).
Source:
White Book, 2nd ed., p. 174 (https://www.qmul.ac.uk/sbcs/iupac/bibliog/white.html)