ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1COP%28%3DO%29%28NC1OO%29N%28CCCl%29CCCl/file?format=sdf&get3d=True  -- C1COP%28%3DO%29%28NC1OO%29N%28CCCl%29CCCl could not be loaded.