ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H28O4/c1-11(2)19(21)23-9-13-5-6-16-17-8-14(18(13)16)7-15(17)10-24-20(22)12(3)4/h13-18H,1,3,5-10H2,2,4H3/file?format=sdf&get3d=True  -- InChI=1S/C20H28O4/c1-11(2)19(21)23-9-13-5-6-16-17-8-14(18(13)16)7-15(17)10-24-20(22)12(3)4/h13-18H,1,3,5-10H2,2,4H3 could not be loaded.