ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/B6.Ca/c1-2-5(1)3-4(5)6(1,2)3;/q-2; 2/file?format=sdf&get3d=True  -- InChI=1S/B6.Ca/c1-2-5(1)3-4(5)6(1,2)3;/q-2; 2 could not be loaded.