ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28C%29CC%28O%29CC%28C%29%28C%29N1%5BO%5D/file?format=sdf&get3d=True -- CC1%28C%29CC%28O%29CC%28C%29%28C%29N1%5BO%5D could not be loaded.