ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DCC%28%3DO%29OC%28CCc2ccccc2%29C1/file?format=sdf&get3d=True  -- COC1%3DCC%28%3DO%29OC%28CCc2ccccc2%29C1 could not be loaded.