13431-34-0 4-Ethyl-3-thiosemicarbazide 4-Ethylthiosemicarbazide B 1131 EINECS 236-553-1 Ethylthiosemicarbazide Hydrazinecarbothioamide, N-ethyl- NSC 84217 Semicarbazide, 4-ethyl-3-thio- (8CI)