In addition to the other 3% to 5% used as veterinary drugs or animal feed additives, most penicillins are also used as raw materials for the preparation of 6-aminopenicillane, 7-aminodeacetoxycephalospenoic acid or chloromethylene cephalosporin mother nuclei, which are converted into products with high added value and put on the market. It is estimated that the current global demand for 6-aminopenicillin is about 25800 tons, and it will reach 32800 tons in 2005. The demand for 7-aminodeacetoxycephem acid is about 6000 tons, compared with 7000 tons in 2005.<br>
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