ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC12COC%28OC1%29%28OC2%29c3ccc%28cc3%29C%23C/file?format=sdf&get3d=True -- CCCC12COC%28OC1%29%28OC2%29c3ccc%28cc3%29C%23C could not be loaded.