ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/Hg.4HI.2K/h;4*1H;;/q+2;;;;;2*+1/p-4/file?format=sdf&get3d=True -- InChI=1S/Hg.4HI.2K/h;4*1H;;/q+2;;;;;2*+1/p-4 could not be loaded.