>>But generally Momenta's only description of those sugars is a description of them as whatever causes Peak 9 in a CE plot. Is this specific enough... or not? Note that they are also somewhat unspecific about exactly what the signature is. <<
Clark, Did you look at figure 1a from the '886 patent?
The plot is milli-absorbance units over time. I'm thinking that's signature enough, because it probably is unique. Would love to get more color on that thought from actual bench scientists like PGS or winchem.