ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C21H42O4/c1-19(2)15-13-11-9-7-5-3-4-6-8-10-12-14-16-21(24)25-18-20(23)17-22/h19-20,22-23H,3-18H2,1-2H3/file?format=sdf&get3d=True  -- InChI=1S/C21H42O4/c1-19(2)15-13-11-9-7-5-3-4-6-8-10-12-14-16-21(24)25-18-20(23)17-22/h19-20,22-23H,3-18H2,1-2H3 could not be loaded.