ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cccc2c1C%28C%29%28CN2c3ccccc3%29CCCNC/file?format=sdf&get3d=True  -- c1cccc2c1C%28C%29%28CN2c3ccccc3%29CCCNC could not be loaded.