ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H12O6/c1-7-10(18)5-14-15(16(7)21)12(20)6-13(22-14)8-2-3-9(17)11(19)4-8/h2-6,17-19,21H,1H3/file?format=sdf&get3d=True  -- InChI=1S/C16H12O6/c1-7-10(18)5-14-15(16(7)21)12(20)6-13(22-14)8-2-3-9(17)11(19)4-8/h2-6,17-19,21H,1H3 could not be loaded.