ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H38/c1-7-15(2)9-11-17-16(3)10-12-18-19(4,5)13-8-14-20(17,18)6/h15-18H,7-14H2,1-6H3/t15-,16 ,17 ,18 ,20-/m1/s1/file?format=sdf&get3d=True  -- InChI=1S/C20H38/c1-7-15(2)9-11-17-16(3)10-12-18-19(4,5)13-8-14-20(17,18)6/h15-18H,7-14H2,1-6H3/t15-,16 ,17 ,18 ,20-/m1/s1 could not be loaded.