acetate the extract was dried with anhydrous sodium sulfate and then subjected to distillation to remove ethyl acetate to obtain crystals the crystals were purified by sublimation to obtain as white crystals 2 43 g 58 5 of a compound of the general formula 2 2 wherein r 1 r 2 r 4 r 5 h and r 3 r 6 ch 3 calc for gec 8 h 12 o 2 s 2 ge 26 22 c 34 70 h 4 37 d 50 ml of thionyl chloride was added to 8 69 g 0 02 mol of dibromobis 1 methyl 2 0carboxypropyl germane which is a compound of the general formula 1 wherein r 1 r 3 r 4 r 6 ch 3 r 2 r 5 h x br and y 1 y 2 oh the mixture was refluxed for 2 hours with heating excessive thionyl chloride was removed by distilation to obtain a corresponding acid chloride 5 74 g 0 015 mol of this acid chloride was dissolved in 100 ml of acetone h 2 s gas was passed therethrough and 4 74 g 0 06 mol of pyridine was added with ice cooling the mixture was stirred for 30 minutes the resulting crystals were removed by filtration the filtrate was subjected to distillation to remove the solvent to obtain crystals the crystals were washed with ethanol.