ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29%28CC12CC3CC%28C1%29CC%28C3%29C2%29N/file?format=sdf&get3d=True -- CC%28C%29%28CC12CC3CC%28C1%29CC%28C3%29C2%29N could not be loaded.