ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H18N2O3.C4H4O4/c21-17-8-14-15(20-17)6-7-16-18(14)23-13(11-22-16)10-19-9-12-4-2-1-3-5-12;5-3(6)1-2-4(7)8/h1-7,13,19H,8-11H2,(H,20,21);1-2H,(H,5,6)(H,7,8)/b;2-1 /t13-;/m0./s1/file?format=sdf&get3d=True  -- InChI=1S/C18H18N2O3.C4H4O4/c21-17-8-14-15(20-17)6-7-16-18(14)23-13(11-22-16)10-19-9-12-4-2-1-3-5-12;5-3(6)1-2-4(7)8/h1-7,13,19H,8-11H2,(H,20,21);1-2H,(H,5,6)(H,7,8)/b;2-1 /t13-;/m0./s1 could not be loaded.