ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2N8O4/c11-7-1-2(4-10(14)5-7)8(12)6-9(13)3-1/file?format=sdf&get3d=True -- InChI=1S/C2N8O4/c11-7-1-2(4-10(14)5-7)8(12)6-9(13)3-1 could not be loaded.