ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCn%28c1C%29c2ccccc2c1C%28%3DO%29c%28ccc3OC%29c4ccccc34/file?format=sdf&get3d=True -- CCCCCn%28c1C%29c2ccccc2c1C%28%3DO%29c%28ccc3OC%29c4ccccc34 could not be loaded.