ERROR opening https://cactus.nci.nih.gov/chemical/structure/ClCCN%28C%29Cc2cc%28Cl%29c%28N/C1%3DN/CCN1%29c%28Cl%29c2/file?format=sdf&get3d=True -- ClCCN%28C%29Cc2cc%28Cl%29c%28N/C1%3DN/CCN1%29c%28Cl%29c2 could not be loaded.