ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CC2%28C13C%3DCC%28%3DO%29O3%29C%3DCC%28%3DO%29O2/file?format=sdf&get3d=True -- C1CC2%28C13C%3DCC%28%3DO%29O3%29C%3DCC%28%3DO%29O2 could not be loaded.