2-[2-Ethoxy-5-[(4-ethylpiperazin-1-yl) sulfonyl]phenyl]-5- methyl-7-propylimidazo [5,1-f][1,2,4][triazin-4(3H)-one hydrochloride trihydrate(or)1-[[3-(1,4-Dihydro-5-methyl-4-oxo-7-propyli midazo[5,1-f] [1,2,4]triazin-2-yl)-4-ethoxy phenyl]sulfonyl]-4-ethyl-Piperazine hydro chloride trihydrate