1-Propanamine, N,N-dimethyl-3-(3-ethyl-9H-thioxanthen-9-ylidene)-, (E)-2- butenedioate (1:1) 3-Ethyl-9-(3-dimethylaminopropylidene)thioxanthene hydrogen fumarate 84964-72-7 N,N-Dimethyl-3-(3-ethyl-9H-thioxanthen-9-ylidene)-1-propanamine fumarate