ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/6CN.Fe.3K/c6*1-2;;;;/q6*-1; 3;3* 1/file?format=sdf&get3d=True -- InChI=1S/6CN.Fe.3K/c6*1-2;;;;/q6*-1; 3;3* 1 could not be loaded.