ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C6H6/c1-2-3%281%296-4%281%295%282%296/h1-6H/file?format=sdf&get3d=True  -- InChI%3DInChI%3D1S/C6H6/c1-2-3%281%296-4%281%295%282%296/h1-6H could not be loaded.