ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/H6N3OP/c1-5(2,3)4/h(H6,1,2,3,4)/file?format=sdf&get3d=True  -- InChI=1S/H6N3OP/c1-5(2,3)4/h(H6,1,2,3,4) could not be loaded.