ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28N%3DCN1%29CSCCNC%28%3DNC%29NC%23N%20/file?format=sdf&get3d=True -- CC1%3DC%28N%3DCN1%29CSCCNC%28%3DNC%29NC%23N%20 could not be loaded.