ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C20H42O/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21/h21H%2C2-20H2%2C1H3/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C20H42O/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21/h21H%2C2-20H2%2C1H3 could not be loaded.