ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C6H9NO4/c8-5(9)3-1-4(6(10)11)7-2-3/h3-4,7H,1-2H2,(H,8,9)(H,10,11)/t3?,4-/m0/s1/file?format=sdf&get3d=True  -- InChI=1S/C6H9NO4/c8-5(9)3-1-4(6(10)11)7-2-3/h3-4,7H,1-2H2,(H,8,9)(H,10,11)/t3?,4-/m0/s1 could not be loaded.