ManLev (N-levulinol mannosamine)

[mmm_klehnert at mednov1.auckland.ac.nz]

Has anyone an idea or reference on where to buy or how to 
synthesize a compound called "ManLev", which is N-levulinoyl 
mannosamine, basically a N-acteylmannosamine in which the amine 
group is substituted by levulinic acid (COOH-CH2-CH2-CO-CH3)?
I'm not a chemist, so I don't think mixing ManNAc and levulinic 
acid will work, and even if so, how to purify the ManLev???

Help required!!!

Looking forward to your replies..., thanks

Klaus