[exim] exim4 and problem with ${extract... and white spaces

Hello,

somehow I'm too stupid...

    o exim4.34

In the 'transports' section of the config file:

uuxtest:
    driver = pipe
    command = /tmp/script ${extract{uux}{uux=/bin/uux rmail=rmail}{$value}}
                                                     ^ space here

[ do not think about the sense, the original is more complicated ;-) ]
exim always tells me about errors and missing '}' resp '{'.

(For the curiuos:
    There's a file called uucp.commands:

    ,-----
    |test.com:   uux=/usr/bin/uux rmail=rmail
    |test.org:   uux=/usr/bin/uuz rmail=zrmail
    `-----

and command *should* be:

    command = ${extract{uux} ${lookup{$domain}lsearch{/etc/exim4/uucp.commands}{$value}}}
                              `------------------v------------------------------------'
                                   where that reads like
                                   test.com: uux=/usr/bin/uux rmai=rmail

What I'm doing wrong here?
(I tried almost(?) every quoting I could thing of...)

Thanks in advance..

    Best regards from Dresden
    Viele Gruesse aus Dresden
    Heiko Schlittermann
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