ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C28H52N2/c1-3-5-7-9-11-15-19-23-27-25-21-17-13-14-18-22-26-28(30-29-27)24-20-16-12-10-8-6-4-2/h17-18,21-22,27-28H,3-16,19-20,23-26H2,1-2H3/b21-17?,22-18?,30-29-/file?format=sdf&get3d=True  -- InChI=1S/C28H52N2/c1-3-5-7-9-11-15-19-23-27-25-21-17-13-14-18-22-26-28(30-29-27)24-20-16-12-10-8-6-4-2/h17-18,21-22,27-28H,3-16,19-20,23-26H2,1-2H3/b21-17?,22-18?,30-29- could not be loaded.