Before revision: The lignols that crosslink are of three main types, all derived from phenylpropane: coniferyl alcohol ( 4-hydroxy-3-methoxyphenylpropane ; its radical, G, is sometimes called guaiacyl), sinapyl alcohol (3,5-dimethoxy-4-hydroxyphenylpropane; its radical, S, is sometimes called syringyl), and paracoumaryl alcohol (4-hydroxyphenylpropane; its radical, H, is sometimes called 4-hydroxyphenyl).
After revision: The lignols that crosslink are of three main types, all derived from phenylpropane: coniferyl alcohol ( 3-methoxy-4-hydroxyphenylpropane ; its radical, G, is sometimes called guaiacyl), sinapyl alcohol (3,5-dimethoxy-4-hydroxyphenylpropane; its radical, S, is sometimes called syringyl), and paracoumaryl alcohol (4-hydroxyphenylpropane; its radical, H, is sometimes called 4-hydroxyphenyl).