ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8)/f/h6H,5H2 (1H-Cytosine)/file?format=sdf&get3d=True  -- InChI=1/C4H5N3O/c5-3-1-2-6-4(8)7-3/h1-2H,(H3,5,6,7,8)/f/h6H,5H2 (1H-Cytosine) could not be loaded.