Assertion: lignin | /r/HasProperty | a polymer of phenols
Facets:
Source sentences:
text: Lignocellulosic biomass is mostly composed of three chemical fractions or precursors, which are cellulose (a glucose polymer), hemicellulose (a sugar polymer predominantly containing pentoses), and lignin (a polymer of phenols) (Sivapragasam 2008; Xie and Gathergood 2013).