“…36, 25.88, 28.99, 30. 33 H 10.27 N 9.51 S 10.89 Gef . C 69.45 H 10.49 N 9.46 S 10.69 I, 1.3,3,7,7, I l , l I-Octamethyl-9-oxa-5-thia-12, I3-diazadispiro[3.1.5.2]tridec-12-en 2920, 2860, 1579 ( N x N ) , 1480-1445, 1393, 1380, 1365, 1318, 1275, 1245, 1106 ( C -0 ) , 1060, (20). 55 (27, C,H;), 41 (47, C3H; I, 1,3,3,7,7, I I, I1-Octamethyl-5-thia-12,I3-diazadispiro[3.I.5.2] , 2980, 2960, 2950, 2938, 2910, 2855, 1572 (N=N), 1470, 1446, 1380, 1361, 1240, 1200, 1180, 1055,1026,970,928,882,854,718,422 I, 1,3,3,7,7,II, 11-0c1amethy~-5,9-dithia-12,13-diazadispiro[3.…”