ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H18N4O2/c21-12-16(22)15(20-19-14-9-5-2-6-10-14)11-17-18-13-7-3-1-4-8-13/h1-11,16,18-19,21-22H,12H2/b17-11+,20-15?/t16-/m1/s1/file?format=sdf&get3d=True  -- InChI=1S/C16H18N4O2/c21-12-16(22)15(20-19-14-9-5-2-6-10-14)11-17-18-13-7-3-1-4-8-13/h1-11,16,18-19,21-22H,12H2/b17-11+,20-15?/t16-/m1/s1 could not be loaded.