ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C16H18O4/c1-8-16(2,3)12-13(17)10-6-5-9(19-4)7-11(10)14(18)15(12)20-8/h5-8,12,15H,1-4H3/t8-,12?,15?/m1/s1/file?format=sdf&get3d=True  -- InChI=1S/C16H18O4/c1-8-16(2,3)12-13(17)10-6-5-9(19-4)7-11(10)14(18)15(12)20-8/h5-8,12,15H,1-4H3/t8-,12?,15?/m1/s1 could not be loaded.