ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc%28cc1%29P%28%3D%5BSe%5D%29%28c2ccccc2%29c3ccccc3/file?format=sdf&get3d=True  -- c1ccc%28cc1%29P%28%3D%5BSe%5D%29%28c2ccccc2%29c3ccccc3 could not be loaded.