3-Methylbutylidene gyromitrin 57590-21-3 Butanal, 3-methyl-, N-formyl-N-methylhydrazone Hydrazinecarboxaldehyde, methyl(3-methylbutylidene)- N-Formyl-N-methylhydrazone 3-methylbutanal NSC272567 WLN: VHN1&NU2Y1&1