19494-89-4 5-21-12-00145 (Beilstein Handbook Reference) 5-HP 5-Hydroxy-2-formylpyridine thiosemicarbazone 5-Hydroxypicolinaldehyde thiosemicarbazone 5-Hydroxypyridine-2-carboxaldehyde thiosemicarbazone BRN 1529208 Hydrazinecarbothioamide, 2-((5-hydroxy-2-pyridinyl)methylene)- (9CI) NSC 107392 PICOLINALDEHYDE,-5-HYDROXY-THIOSEMICARBAZONE Picolinaldehyde, 5-hydroxy-, thiosemicarbazone