A process for the stereoselective microbial reduction of compound of formula (II) to compound of formula (I) comprising adding compound of formula (II) to a medium, medium and buffer, medium and solvent, or medium and a mixture of buffer and solvent containing a microorganism, preferably Rhodococcus fascians or fungal isolate Geotrichum candidum, incubating the resulting mixture, and isolating a hydroxy compound of formula (I), is described. The compound of formula (I) is a serum cholesterol lowering agent.
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