ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C2H5N3O2/c3-1(6)5-2(4)7/h(H5,3,4,5,6,7)/file?format=sdf&get3d=True  -- InChI=1S/C2H5N3O2/c3-1(6)5-2(4)7/h(H5,3,4,5,6,7) could not be loaded.