ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28CC%29CCn1c%28nc2ccccc12%29N3CCCN%28C%29CC3/file?format=sdf&get3d=True  -- O%28CC%29CCn1c%28nc2ccccc12%29N3CCCN%28C%29CC3 could not be loaded.