ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cn2ccc%28c2c3%29cc1c3CCN1C%28%3DO%29Nc4cccnc4/file?format=sdf&get3d=True  -- Cn2ccc%28c2c3%29cc1c3CCN1C%28%3DO%29Nc4cccnc4 could not be loaded.