ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H10O2/c7-6-4-2-1-3-5-8-6/h1-5H2/file?format=sdf&get3d=True  -- InChI=1S/C6H10O2/c7-6-4-2-1-3-5-8-6/h1-5H2 could not be loaded.