TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): Preparation of (Q) comprises adding Cunninghamella elegans having preservation number of ATCC9245 into a fermenting liquid, centrifuging the fermented liquid, adjusting pH value to 6.8 using phosphoric acid buffering liquid and then mixing bacteria-containing suspension as 30-40 g/l of biological catalyst and substrate and adding 0.2-0.8% of anhydrous ethanol as solvent to form reaction system, oscillating the reaction mixture at 25-32 degrees C, speed of 150-300 revolutions per minute (rpm), performing conversion reaction, and separating and purifying the reaction solution, where the concentration of substrate is 20-80 mg/l. Preferred Method: The converting reaction is carried out for 3 days. The biological catalyst is prepared by inoculating Cunninghamella elegans strain into a potato agar culture medium, culturing the inoculated material at 25-32 degrees C for 2-4 days to obtain Cunninghamella elegans spore and then activating in a potato liquid culture medium and dipping in cotton swab, shaking the culture at 25-32 degrees C and speed of 150-300 rpm for 2-3 days to obtain seed liquid, inoculating 1-5% of seed liquid into the potato liquid medium, shaking the liquid at 25-32 degrees C and speed of 150-300 rpm for 2-4 days to obtain fermentation liquid, centrifuging the fermentation liquid, removing supernatant, and collecting precipitate to obtain wet cell, and adjusting pH value to 6.8 using phosphoric acid buffering liquid. The separating and purifying steps comprise filtering the reaction solution with ethyl acetate to obtain filtered liquid and then extracting for 2-3 times, combining the ethyl acetate liquid, decompressing and distilling the mixture to remove ethyl acetate, dissolving the distilled mixture in anhydrous methanol and then separating by a chromatography, then adding 30-70 vol.% of aqueous solution of ethanol as eluent, collecting 70 vol.% of effluent liquid, decompressing and concentrating the liquid to remove eluent to obtain (I) and (II), mixing separated liquid by HPLC, where the volume ratio of methanol and water is 1:1, detecting wave length of 240 nm, collecting effluent, and decompressing and concentrating the effluent and then vacuum drying. Preferred Components: The amount of biological catalyst is 35 g/l. The concentration of substrate is 60 mg/l. The concentration of anhydrous ethanol is 0.6 vol.%.