ERROR opening https://cactus.nci.nih.gov/chemical/structure/O1COC2C%3DCC%28%3DCC1%3D2%29CC%28C%29%5BN%2B%5D%28C%29%28C%29C/file?format=sdf&get3d=True  -- O1COC2C%3DCC%28%3DCC1%3D2%29CC%28C%29%5BN%2B%5D%28C%29%28C%29C could not be loaded.