487-16-1 GS 1752 Hydrazinecarbothioamide, 2-(1,2-dihydro-2-oxo-3H-indol-3-ylidene)- IBT Indole-2,3-dione, 3-(thiosemicarbazone) Isatin .beta.-thiosemicarbazone Isatin 3-thiosemicarbazone Isatin thiosemicarbazone Isatin-.beta.-thiosemicarbazone NSC 721 NSC721