ERROR opening https://cactus.nci.nih.gov/chemical/structure/c12c3c4c5c6c7c8c1c9sc2sc3sc4sc5sc6sc7sc8s9/file?format=sdf&get3d=True  -- c12c3c4c5c6c7c8c1c9sc2sc3sc4sc5sc6sc7sc8s9 could not be loaded.