Assertion: lignin | /r/CapableOf | show small signals
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Source sentences:
text: The 31P-NMR spectra recorded for lignins derivatized with butyric or isobutyric anhydrides (Fig. 1) did not present signals for hydroxyl groups, whereas the lignin derivatized with crotonic anhydride showed small signals corresponding to hydroxyls linked to aliphatic chains or guayacyl groups.