ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H7N5/c3-1(4)7-2(5)6/h(H7,3,4,5,6,7)/file?format=sdf&get3d=True  -- InChI=1S/C2H7N5/c3-1(4)7-2(5)6/h(H7,3,4,5,6,7) could not be loaded.