ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cc%28O%29c2C%28%3DO%29OC%28C%29Cc2c1/file?format=sdf&get3d=True -- COc1cc%28O%29c2C%28%3DO%29OC%28C%29Cc2c1 could not be loaded.