“…, 65-5(15), 65(5), 64(16), 63(18), 52.5(14), 52(10), 51*5(10), 51(18), 50(14), 39(10).1 ,3-Dimethyl-1 H-2,1,3-benzothiadiazin-4, (3H)-one 2,2-dioxide (VII) 227(12), 226(100), 161(16), 147(4), 134(8), 133(41), 132(9), 106(8), 105(88), 104(49), 92(8), 90(4), 78(20), 77(16), 76(4), 64(8), 63(12), 51(16), 50(8), 39(12).3-Trideuteroinethyl-1 H-2,1,3-benzothiadiazin-4, (3H)-one 2,2-dioxide (VIII) 216(10), 215(100), 150(0.7), 149(3), 137(4), 136(35), 135(2), 134(5), 133(2), 122…”