ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H20N2/c1-17-15(13-9-5-3-6-10-13)16(18-2)14-11-7-4-8-12-14/h3-12,15-18H,1-2H3/t15-,16-/m0/s1/file?format=sdf&get3d=True  -- InChI=1S/C16H20N2/c1-17-15(13-9-5-3-6-10-13)16(18-2)14-11-7-4-8-12-14/h3-12,15-18H,1-2H3/t15-,16-/m0/s1 could not be loaded.