ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29C1CCC2C1%28CC%28C3C2CCC4%3DCC%28%3DO%29CCC34C%29O%29C/file?format=sdf&get3d=True -- CC%28%3DO%29C1CCC2C1%28CC%28C3C2CCC4%3DCC%28%3DO%29CCC34C%29O%29C could not be loaded.