ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H18O4/c1-11(2)8-9-13-14(19)10-15(20)16(18(13)22)17(21)12-6-4-3-5-7-12/h3-8,10,19-20,22H,9H2,1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C18H18O4/c1-11(2)8-9-13-14(19)10-15(20)16(18(13)22)17(21)12-6-4-3-5-7-12/h3-8,10,19-20,22H,9H2,1-2H3 could not be loaded.