Piperazine, 1-(4-amino-6,7-dimethoxy-2-quinazolinyl)-4-(2-furanylcarbonyl)-, monohydrochloride, mixt. with 6-chloro-3,4-dihydro-2-methyl-3-(((2,2,2-trifluoroethyl)thio)methyl)-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide