1-Propanamine, N,N-dimethyl-3-thieno(2,3-c)(2)benzothiepin-4(9H)-ylidene, (Z)-, (Z)-2-butenedioate (1:1) 55407-74-4 cis-4-(3-Dimethylaminopropylidene)-9H-thieno(2,3-b)benzo(e)thiepin hydrogen maleate cis-Dithiadene hydrogen maleate