21044-89-3 4H-1,3-BENZOXAZIN-4-ONE, 6-(DIMETHYLAMINO)-2,3-DIHYDRO-3-PROPYL-, MALEATE (1:1) 6-(Dimethylamino)-2,3-dihydro-3-propyl-4H-1,3-benzoxazin-4-one maleate 6-Dimethylamino-3-n-propyl-2,3-dihydro-4H-1,3-benzoxazin-4-one maleate