ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4cc%28C%29cc3c4nc2c3CCNC2Cc%28cc1OC%29ccc1OC/file?format=sdf&get3d=True  -- c4cc%28C%29cc3c4nc2c3CCNC2Cc%28cc1OC%29ccc1OC could not be loaded.