ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BC%40%40H%5D%28c1ccc2nccn2c1%29n1nnc2ncc%28-c3cnn%28C%29c3%29nc21/file?format=sdf&get3d=True  -- C%5BC%40%40H%5D%28c1ccc2nccn2c1%29n1nnc2ncc%28-c3cnn%28C%29c3%29nc21 could not be loaded.