ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI%3DInChI%3D1S/C2H6N2O/c1-4-2%283%295/h1H3%2C%28H3%2C3%2C4%2C5%29/file?format=sdf&get3d=True -- InChI%3DInChI%3D1S/C2H6N2O/c1-4-2%283%295/h1H3%2C%28H3%2C3%2C4%2C5%29 could not be loaded.