ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c4c%28c%28cc1c2ccccc2%29CCC3CCNCC3%29cccc4/file?format=sdf&get3d=True  -- n1c4c%28c%28cc1c2ccccc2%29CCC3CCNCC3%29cccc4 could not be loaded.