2138-40-1 3-(Dimethylamino)-1-(4-nitrophenyl)-1-propanone 4-Nitro-3-dimethylaminopropiophenone hydrochloride NDPP Ro 03-6156 beta-N,N-Dimethyl-4-itropropiophenone beta-N,N-Dimethyl-p-nitropropiophenone p-Nitro-3-dimethylaminopropiophenone hydrochloride