ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H18N2O4S.Na/c1-16(2)12(15(21)22)18-13(20)11(14(18)23-16)17-10(19)8-9-6-4-3-5-7-9;/h3-7,11-12,14H,8H2,1-2H3,(H,17,19)(H,21,22);/q; 1/file?format=sdf&get3d=True  -- InChI=1S/C16H18N2O4S.Na/c1-16(2)12(15(21)22)18-13(20)11(14(18)23-16)17-10(19)8-9-6-4-3-5-7-9;/h3-7,11-12,14H,8H2,1-2H3,(H,17,19)(H,21,22);/q; 1 could not be loaded.