ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C19H12N4/c20-23-22-14-11-9-13(10-12-14)19-15-5-1-3-7-17(15)21-18-8-4-2-6-16(18)19/h1-12H/file?format=sdf&get3d=True  -- InChI=1S/C19H12N4/c20-23-22-14-11-9-13(10-12-14)19-15-5-1-3-7-17(15)21-18-8-4-2-6-16(18)19/h1-12H could not be loaded.