Assertion: lignin's effect | /r/HasProperty | obtained by acetylation
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Source sentences:
text: It is therefore difficult to explain the stabilizing effect obtained by acetylation as a protection of the -O-4 aryl ether bond, since it has been suggested that most of the degradation of such bonds proceeds via cleavage of arylglycerol -aryl ether structures (Fig. 7, Path A).