ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H26N4O2/c1-13(15-5-3-2-4-6-15)21-18(20-12-17(23)24)22-16-9-7-14(11-19)8-10-16/h2-10,13,17-18,20-24H,11-12,19H2,1H3/t13-,18-/m1/s1/file?format=sdf&get3d=True -- InChI=1S/C18H26N4O2/c1-13(15-5-3-2-4-6-15)21-18(20-12-17(23)24)22-16-9-7-14(11-19)8-10-16/h2-10,13,17-18,20-24H,11-12,19H2,1H3/t13-,18-/m1/s1 could not be loaded.