ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%3DCN2C1%3DNC%3DC%28C2%3DO%29C3%3DNNN%3DN3/file?format=sdf&get3d=True  -- CC1%3DCC%3DCN2C1%3DNC%3DC%28C2%3DO%29C3%3DNNN%3DN3 could not be loaded.