ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCOc1cc%28ccc1OC%29NC%28%3DO%29c3ccc%28cc3%29-c2ccc%28cc2C%29-c4noc%28C%29n4/file?format=sdf&get3d=True -- CN%28C%29CCOc1cc%28ccc1OC%29NC%28%3DO%29c3ccc%28cc3%29-c2ccc%28cc2C%29-c4noc%28C%29n4 could not be loaded.