ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1c%28cc%28c%28C%28Cn2ncnc2%29%28O%29Cn2cncn2%29c1%29F%29F/file?format=sdf&get3d=True -- c1c%28cc%28c%28C%28Cn2ncnc2%29%28O%29Cn2cncn2%29c1%29F%29F could not be loaded.