ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/3C2H2O4.H2O.2Pr/c3*3-1(4)2(5)6;;;/h3*(H,3,4)(H,5,6);1H2;;/q;;;;2* 3/p-6/file?format=sdf&get3d=True  -- InChI=1S/3C2H2O4.H2O.2Pr/c3*3-1(4)2(5)6;;;/h3*(H,3,4)(H,5,6);1H2;;/q;;;;2* 3/p-6 could not be loaded.