ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1c2ccccc2nn1%2C%20c1ccc2c%28c1%29%26%2391%3BnH%26%2393%3Bnn2/file?format=sdf&get3d=True -- n1c2ccccc2nn1%2C%20c1ccc2c%28c1%29%26%2391%3BnH%26%2393%3Bnn2 could not be loaded.