ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C6H18N3OP/c1-7(2)11(10,8(3)4)9(5)6/h1-6H3/file?format=sdf&get3d=True  -- InChI=1/C6H18N3OP/c1-7(2)11(10,8(3)4)9(5)6/h1-6H3 could not be loaded.