ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCCN1c2ccccc2C%28%3DNc3c1nccc3%29c4ccccc4/file?format=sdf&get3d=True  -- CN%28C%29CCCN1c2ccccc2C%28%3DNc3c1nccc3%29c4ccccc4 could not be loaded.