ERROR opening https://cactus.nci.nih.gov/chemical/structure/n2c4c1ccccc1Cc4sc2Cc3c%5BnH%5Dcn3/file?format=sdf&get3d=True  -- n2c4c1ccccc1Cc4sc2Cc3c%5BnH%5Dcn3 could not be loaded.