ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C6H6/c1-2-3(1)6-4(1)5(2)6/h1-6H/file?format=sdf&get3d=True -- InChI=1/C6H6/c1-2-3(1)6-4(1)5(2)6/h1-6H could not be loaded.