ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc2c%28c1%29C%28%3DO%29OC23c4ccc%28cc4Oc5c3ccc%28c5%29O%29O/file?format=sdf&get3d=True -- c1ccc2c%28c1%29C%28%3DO%29OC23c4ccc%28cc4Oc5c3ccc%28c5%29O%29O could not be loaded.