Supplier of HATU for peptide synthesis

[E.T. Hitchen]

Hi,

Does anybody know of an alternative supplier of HATU 
(O-(7-Azabenzotriazol-1-yl)-1,1,3,3-Tetramethyl-Uronium Hexafluorophosphate) besides 
Perspective Biosystems ?

Also, I gather some people use a similar chemical called HBTU instead of HATU in 
peptide synthesis. Does anyone have any experience of HBTU - is it better or worse 
than HATU ?

If anyone can answer any of the questions I would be grateful if you could let me 
know.

Thanks

Mark Ward
University of Wolverhampton, England
E-Mail: cs1958 at mail.wlv.ac.uk