Figure 5From: Down-regulation of the caffeic acid O-methyltransferase gene in switchgrass reveals a novel monolignol analog(a) Chemical structures with atom numbering for sinapyl and iso -sinapyl alcohols. Spin density calculations for (b) sinapyl and (c) iso- sinapyl radicals. Potential coupling sites for iso-sinapyl radical are C2, C4, O5 and C6. In comparison to sinapyl radical, iso-sinapyl has one less coupling site and lacks reactivity at C8 in particular.Back to article page