1 38 s 9h 1 4 s 3h 1 42 s 3h 3 1 u02dc 3 5 m 3 55 u02dc 3 68 ab j 15hz 2h 5 13 d j 4hz 1h 5 80 dd j 4hz 8hz 1h 6 62 d j 8hz 1h 6 71 s 1h 6 89 d j 8hz 1h 7 26 bs 1h 9 34 d j 8hz 1h 9 89 bs 1h 10 16 bs 1h title product of example 14 0 759 was dissolved in trifluoroacetic acid 3 75 ml after stirring at room temperature for 2 hours the solution was concentrated to a solid which was washed with iscpropylether 7 5 ml and dried in vacuo the resulting solids were dissolved in a mixture of water 7 2 ml and ethylacetate 3 6 ml and dissolved by adjusting the ph to 4 5 with sodium bicarbonate the aqueous layers were washed with ethylacetate 3 6 ml and diluted with water 7 2 ml after stirring at 10 u00b0 c the solution was adjusted to ph 2 5 with 6nhcl the resulting solids were filteted off washed with water and dried in vacuo to give the title compound 0 54 g nmr cmso d 6 1 42 s 3h 1 43 s 3h 3 1 u02dc 3 5 m 3 60 s 2h 5 14 d j 5hz 1h 5 81 dd j 5hz 8hz 1h 6 623 d j 8hz 1h 6 72 s 1h 6 89 d j 8hz 1h 7 30 bs 2h 9 42 d j 8hz 1h 9 91 bs 1h 10 18 bs 1h the title product of example 6 4 38 g was dissolved in ethanol 35ml to the solution was added 6nhci 35.