ERROR opening https://cactus.nci.nih.gov/chemical/structure/n12c%28nn%28c1%3DO%29CCCN1CCN%28c3cc%28ccc3%29Cl%29CC1%29cccc2/file?format=sdf&get3d=True  -- n12c%28nn%28c1%3DO%29CCCN1CCN%28c3cc%28ccc3%29Cl%29CC1%29cccc2 could not be loaded.