ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/3ClH.K.Mg/h3*1H;;/q;;;+1;+2/p-3/file?format=sdf&get3d=True -- InChI=1S/3ClH.K.Mg/h3*1H;;/q;;;+1;+2/p-3 could not be loaded.