ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%26%2361%3BNC2%26%2361%3BC%28C%28%26%2361%3BO%29N%26%2361%3BC%28N2%29N%29NC1%26%2361%3BO/file?format=sdf&get3d=True -- C1%26%2361%3BNC2%26%2361%3BC%28C%28%26%2361%3BO%29N%26%2361%3BC%28N2%29N%29NC1%26%2361%3BO could not be loaded.