ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1n3c%28nc4c%28c3nc1c2occc2%29cnn4CCCc5ccc%28OC%29cc5%29N/file?format=sdf&get3d=True  -- n1n3c%28nc4c%28c3nc1c2occc2%29cnn4CCCc5ccc%28OC%29cc5%29N could not be loaded.