ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4ccccc4CNCC%28CO2%29Oc1c2ccc%28N3%29c1CC3%3DO/file?format=sdf&get3d=True  -- c4ccccc4CNCC%28CO2%29Oc1c2ccc%28N3%29c1CC3%3DO could not be loaded.