ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BN%2B%5D1%28CCOCC1%29C2%3DNC%28%3DNC%28%3DN2%29OC%29OC.%5BCl-%5D/file?format=sdf&get3d=True -- C%5BN%2B%5D1%28CCOCC1%29C2%3DNC%28%3DNC%28%3DN2%29OC%29OC.%5BCl-%5D could not be loaded.