1H-Imidazol-2-amine, N-(2,3-dihydro-1,4-benzodioxin-6-yl)-4,5-dihydro-, (Z)-2-butenedioate (1:1) 2-(6-(1,4-Benzodioxanyl)amino)imidazoline maleate 87135-04-4 RX 801074 RX-801074