ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC2C%28O2%29CC1COC%28%3DO%29C3CCC4C%28C3%29O4/file?format=sdf&get3d=True  -- C1CC2C%28O2%29CC1COC%28%3DO%29C3CCC4C%28C3%29O4 could not be loaded.