ERROR opening https://cactus.nci.nih.gov/chemical/structure/Oc2ccccc2CNCCc%28c%28OC%29cc1I%29cc1OC/file?format=sdf&get3d=True  -- Oc2ccccc2CNCCc%28c%28OC%29cc1I%29cc1OC could not be loaded.