Need help; urgent need for xylulose-5-phosphate

[bu su]

Dear all
 I am a Ph. D student in Biochemistry. I need xylulose-5-phosphate as a HPLC
standard. The product was stop producing this year, but i find it was listed
in the Sigma 2001-2002 catalog. So I suppose there is some stock in the
Sigma main company, yet the result seems that its impossible to buy from
Sigma, Fluka etc.
 I wonder if there is anyone who could kindly supply some for me 10-20mg is
OK. I'll pay the chemicals including the post fee.
 Thank you so much in advance.

Susana B