ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C4H9NO4/c5-3(4(8)9)2(7)1-6/h2-3,6-7H,1,5H2,(H,8,9)/t2-,3 /m1/s1/file?format=sdf&get3d=True  -- InChI=1S/C4H9NO4/c5-3(4(8)9)2(7)1-6/h2-3,6-7H,1,5H2,(H,8,9)/t2-,3 /m1/s1 could not be loaded.