Assertion: lignin's structure | /r/HasProperty | common photoproducts
Facets:
value: from substrates
type: OTHER
Source sentences:
text: Structures of both types are common photoproducts from lignin model compounds and substrates like mechanical pulps (Hemmingson and Wong 1989; Sjöholm et al. 1992; Pan et al. 1992, 1993, 1994; Argyropoulos and Sun 1996).