title: Application of ninhydrin-sulfuric acid reagent to the determination of micro amounts of 3-dimethyl-amino-1,1-di(2-thienyl)but-1-ene (Ohton).
mesh_terms: D000700:Analgesics; D055598:Chemical Phenomena; D002621:Chemistry; D007202:Indicators and Reagents; D010880:Piperidines; D013057:Spectrum Analysis
chemical_list: D000700:Analgesics; D007202:Indicators and Reagents; D010880:Piperidines