ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/2C5H7O2.Mn/c2*1-4(6)3-5(2)7;/h2*3H,1-2H3;/q2*-1;+2/file?format=sdf&get3d=True  -- InChI=1S/2C5H7O2.Mn/c2*1-4(6)3-5(2)7;/h2*3H,1-2H3;/q2*-1;+2 could not be loaded.