ERROR opening https://cactus.nci.nih.gov/chemical/structure/COSi%28C%29%28C%29OSi%28C%29%28C%29C.O%3DSi%3DO/file?format=sdf&get3d=True  -- COSi%28C%29%28C%29OSi%28C%29%28C%29C.O%3DSi%3DO could not be loaded.