1D15:
reference: Ternary interactions of spermine with DNA: 4'-epiadriamycin and other DNA: anthracycline complexes., Williams LD, Frederick CA, Ughetto G, Rich A, Nucleic Acids Res 1990 Sep 25;18(18):5533-41. PMID: 2216725

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