34 and fractions containing the end product were collected the fraction was concentrated at 30 u00b0 c to yield 60 g of a concentrate a 300 ml amount of ethanol was added to the concentrate with stirring after being cooled to 10 u00b0 c the solution was allowed to stand for one hour and a precipitate formed which was collected by filtration under reduced pressure and dried in vacuo at 40 u00b0 c to obtain 6 9 g of the desired end product yield 72 reverse phase tlc of 20 u03bcg of this substance gave a single spot a 13 7 g amount of a crude product containing 9 6 g of the desired end product prepared according to the procedure described in example 1 was dissolved in 400 ml of 30 u00b0 c water and the ph of the solution was adjusted to 2 5 by adding 6 n hydrochloric acid thereto after continuing stirring for 30 minutes a precipitate formed which was removed by filtration and the mother liquor was concentrated to a quantity of 80 g at 30 u00b0 c under reduced pressure a 400 ml amount of ethanol was added with stirring to this concentrate after being cooled to 10 u00b0 c the solution.