2-Formylthiophene thiosemicarbazone 2-Thiophenealdehyde thiosemicarbazone 2-Thiophenecarboxaldehyde thiosemicarbazone 2-Thiophenecarboxaldehyde, thiosemicarbazone 5351-91-7 Hydrazinecarbothioamide, 2-(2-thienylmethylene)- NSC734