ERROR opening https://cactus.nci.nih.gov/chemical/structure/C3COCCN3CCCCC%28%3DO%29Nc1ccc%28cc1%29-c2cccnc2/file?format=sdf&get3d=True  -- C3COCCN3CCCCC%28%3DO%29Nc1ccc%28cc1%29-c2cccnc2 could not be loaded.