1-Methyl-2-thiosemicarbazide 4-Methyl-3-thiosemicarbazide 4-Methylthiosemicarbazide 6610-29-3 B 1130 Hydrazinecarbothioamide, N-methyl- Methylthiosemicarbazide NSC56911 Semicarbazide, 4-methyl-3-thio-