1CAR:
reference: Iota-carrageenan: molecular structure and packing of polysaccharide double helices in oriented fibres of divalent cation salts., Arnott S, Scott WE, Rees DA, McNab CG, J Mol Biol 1974 Dec 5;90(2):253-67. PMID: 4453016

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).