ERROR opening https://cactus.nci.nih.gov/chemical/structure/c16ccc2ccc3ccc5c4c%28c1c2c34%29c%28cc5%29cc6/file?format=sdf&get3d=True -- c16ccc2ccc3ccc5c4c%28c1c2c34%29c%28cc5%29cc6 could not be loaded.