ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BAs%5D12%5BAs%5D3%5BAs%5D1%5BAs%5D23/file?format=sdf&get3d=True  -- %5BAs%5D12%5BAs%5D3%5BAs%5D1%5BAs%5D23 could not be loaded.