ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BTc%2B3%5D.%5BI-%5D.%5BI-%5D.%5BI-%5D/file?format=sdf&get3d=True  -- %5BTc%2B3%5D.%5BI-%5D.%5BI-%5D.%5BI-%5D could not be loaded.