increases thus at 0 2 molar concentration of the dihydroxycyclopentene the ratio of monoacetate to diacetate product is 1 to 1 at 1 molar it is 3 3 2 and at 2 molar it is 3 6 to 2 other factors which influences the transesterification include the temperature of the reaction use of pancreatin or lipase and the addition of varying amounts of triethylamine as shown in table 2 optimum conditions for the transesterification are the use of pancreatin at 5 u00b0 c with added triethylamine at a concentration of 2 molar of dihydroxycyclopentene results listed in table 2 are from reactions conducted using the conditions described in the example without further elaboration one skilled in the art can using the preceding description practice the present invention to its fullest extent the following detailed example describes how to prepare the compound and perform the various processes of the invention and is to be construed as merely illustrative and not a limitation of the preceding disclosure in any way whatsoever a pancreatin sigma p 7545 8x usp was assayed for water using standard karl fisher titration and determined to be 4 4 b pancreatin 39 16 g cis 1 4 dihydroxycyclopent 2 ene 40 g johnson c r et al u s pat no 4 873 360 vinyl acetate 221 ml and triethylamine 2 8 ml were dissolved in 200 ml of tetrahydrofuran c water 0 84 g was added to bring the water to 6 5 by weight of the pancreatin d.