1D22:
reference: Binding of the antitumor drug nogalamycin and its derivatives to DNA: structural comparison., Gao YG, Liaw YC, Robinson H, Wang AH, Biochemistry 1990 Nov 13;29(45):10307-16. PMID: 2261474

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