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THE FIRST TOTAL SYNTHESIS OF TAXAMAIRIN B Taxamairin B, representive of rare naturally-occuring rearrang-ed 9(10→20)-abeo-8, 11, 13-triene diterpenoids, has been firstsynthesized by a eleven-step route in an overall yield of 8.19%,starting from commercially available catechol and 1,3-cyclohexan-dione. The improved Friedel-Crafts annulation, thermodynamicallycontrolled-geminal pairing methylation, the selective oxidation ofallyl group and the selective reduction of the less-hindrancecarbon-carbon double bond are the key steps.

二。美丽红豆杉素B的全合成研究 1，美丽红豆杉素B的首次全合成以价廉，易得的邻苯二酚和1，3-环己二酮为原料，经过改良的Friedel-Crafts烷基化反应，热力学控制的α，β-不饱和酮结构的α一位双烷基化，烯丙位的选择性氧化，以及选择性还原位阻较小的碳碳双键等十一步反应，以8.19％的总收率首次完成了美丽红豆杉素B的全合成。

Testing media for 'Mother of Vinegar' in Anolyte systems is not commercially available.

测试媒介为'醋的母亲' 在阳极电解液系统不是通商上可得到的。

These " anonymous " FTP servers can contain a broad range of data that is publicly available through FTP.

这些"匿名"FTP服务器可包含能够通过FTP公开获得的广泛数据。

Where files available for anonymous FTP will be kept.

默认情况下，FTP 的根目录将被放在/var下。

All genotypes and marker descriptions contributed to the CEPH database are also available on the anonymous FTP server.

这些基因型和遗传标记注释都可以通过匿名FTP服务器下载。

It is so sorry that I'm not available to answer your phone now.

另一种在电话上说的表达法是。。。。。

You can obtain more information about insulin injectors by visiting a company抯 Web site, such as that available from Antares Pharma, Inc.

你可以在我们的网站上得到胰岛素注射器的详细信息 www.mediject.com 。

After all, even the antediluvian computers then available had brought on a great deal of abuse from some who saw their jobs in jeopardy.

毕竟即便那时候老掉牙的计算机都会引发感到自己的工作处于危险中的那些人们的谩骂。

At present, several definitions are available for the acetabular anteversion and inclination, whereas there are different expressions for one definition.

目前髋臼前倾角和外展角有多种定义，即使对于同一种定义，也有多种不同的表达方式。

It is also the only easily available anthology of Sellers' recorded material.

这也是卖方的录音材料不仅容易获得选集。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。