ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H4O4.2Na/c5-3(6)1-2-4(7)8;;/h1-2H,(H,5,6)(H,7,8);;/q;2* 1/p-2/b2-1 ;;/file?format=sdf&get3d=True  -- InChI=1S/C4H4O4.2Na/c5-3(6)1-2-4(7)8;;/h1-2H,(H,5,6)(H,7,8);;/q;2* 1/p-2/b2-1 ;; could not be loaded.