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