https://doi.org/10.1351/goldbook.B00683
A @[email protected] that is a @[email protected] In the @[email protected] macromolecules of a @[email protected] @[email protected], adjacent blocks are constitutionally different, i.e. adjacent blocks comprise @[email protected] derived from different species of @[email protected] or from the same species of @[email protected] but with a different composition or @[email protected] distribution of constitutional units.