Except for the fermentation step, the total yield of the five chemical synthetic steps is 29%.

除微生物发酵步骤，后五步化学合成法的总收率可达29%。

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This paper reports about the chemical synthetic method of the urea hydrogen peroxide with urea and hydrogen peroxide.

以尿素与过氧化氢为原料合成过氧化氢脲，对其合成方法进行了筛选。

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This study investigates the various approaches in chemical synthetic as well as purification and developments of re - Search.

作者论述了蔗糖酯的各种化学合成、分离提纯方法及其研究进展。

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Worried specifically about synthetic chemical pesticides?

FORBES: Bittman of the 'New York Times': Always Out To Lunch

The shift toward synthetic chemical medicines occurred in the 20th Century, but according to Mark Blumenthal, the founder and executive director of the American Botanical Council, there is renewed interest in the medicinal benefits of natural foods - including those found in the pills.

BBC: Plants found in ancient pills offer medicinal insight

This approach, which has been repeatedly condemned by the scientific community, has discouraged the development of new pest-resistant crops, encouraged greater use of synthetic chemical pesticides, and limited the use of the newest genetic engineering technology mainly to larger developers who can pay the inflated regulatory costs.

FORBES: EPA Biotech Regulation Bucks The Scientific Consensus