ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C20H31NO4/c1-23-19-8-7-15%2813-20%2819%2924-2%2910-12-25-18-6-4-3-5-17%2818%2921-11-9-16%2822%2914-21/h7-8%2C13%2C16-18%2C22H%2C3-6%2C9-12%2C14H2%2C1-2H3/t16-%2C17-%2C18-/m1/s1/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C20H31NO4/c1-23-19-8-7-15%2813-20%2819%2924-2%2910-12-25-18-6-4-3-5-17%2818%2921-11-9-16%2822%2914-21/h7-8%2C13%2C16-18%2C22H%2C3-6%2C9-12%2C14H2%2C1-2H3/t16-%2C17-%2C18-/m1/s1 could not be loaded.