ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H20N2O2/c1-2-5-18(6-3-1)7-4-12-10-17-14-9-16-15(8-13(12)14)19-11-20-16/h8-10,17H,1-7,11H2/file?format=sdf&get3d=True  -- InChI=1S/C16H20N2O2/c1-2-5-18(6-3-1)7-4-12-10-17-14-9-16-15(8-13(12)14)19-11-20-16/h8-10,17H,1-7,11H2 could not be loaded.