Octyl methoxycinnamate (OMC)-- 常被译为甲氧基肉桂酸辛酯, (也有被译为辛基甲氧基肉桂酸的), Octyl- 辛基. methyl 甲基, cinnamate 桂皮. 关于这个或中文或英文的网页都铺天盖地, 绝大部分与防紫外线有关. http://www.google.com/search?hl=en&q=桂皮 octyl&btnG=Search

再一查, Octyl methoxycinnamate 还常被译成桂皮酸盐.
http://www.google.com/search?hl=en&q=桂皮 octyl&btnG=Search

摘一下wikipedia 上的:
"Octyl methoxycinnamate, or octinoxate, is an organic compound that is an ingredient in some sunscreens. It is an ester formed from methoxycinnamic acid and 2-ethylhexanol. It is a clear liquid that is insoluble in water.
Its primary use is in suncreens and other cosmetics to absorb UV-B rays from the sun, protecting the skin from damage."
http://en.wikipedia.org/wiki/Octyl_methoxycinnamate

怀疑原文指的就是这个, 因为一种有效成份很难想象是 "xxxx辛基"(xxx基 都只是活性基团不是物质分子嘛), 辛酯的可能性更大.

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Note added at 58 mins (2007-02-13 03:25:32 GMT)
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http://www.google.com/search?hl=en&q="Octyl methoxycinnamate...
不好意思, 第一个 link 贴错了, 应该是这个-- (译为甲氧基肉桂酸辛酯和辛基甲氧基肉桂酸的)