ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c%28onc1c2ccccc2%29NCCN%28CCCC%29CCCC/file?format=sdf&get3d=True  -- n1c%28onc1c2ccccc2%29NCCN%28CCCC%29CCCC could not be loaded.