ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H24N4O2/c1-3-21-15-6-4-5-7-16(15)22(18(21)24)17(23)19-12-10-13-8-9-14(11-12)20(13)2/h4-7,12-14H,3,8-11H2,1-2H3,(H,19,23)/t12?,13-,14?/m0/s1/file?format=sdf&get3d=True  -- InChI=1S/C18H24N4O2/c1-3-21-15-6-4-5-7-16(15)22(18(21)24)17(23)19-12-10-13-8-9-14(11-12)20(13)2/h4-7,12-14H,3,8-11H2,1-2H3,(H,19,23)/t12?,13-,14?/m0/s1 could not be loaded.