ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H16O4/c1-19-15-6-5-11(9-16(15)20-2)3-4-12-7-13(17)10-14(18)8-12/h3-10,17-18H,1-2H3/file?format=sdf&get3d=True -- InChI=1S/C16H16O4/c1-19-15-6-5-11(9-16(15)20-2)3-4-12-7-13(17)10-14(18)8-12/h3-10,17-18H,1-2H3 could not be loaded.