reaction mass of: (1RS, 2SR, 7SR, 8SR, E) 9 and 10-ethylidene-3-oxatricyclo[6.2.1.0(2,7)]undecan-4-one;
reaction mass of: (1RS,2SR,7SR,8SR,E) 9 and 10-ethylidene-3-oxatricyclo[6.2.1.0(2,7)]undecan-4-one;