Lignin is formed by the irreversible removal of water from sugars, creating aromatic compounds. Lignin polymers are thus making up cross-connected structures.
External Link
... 2nd century - 3rd century - 4th century Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s Years: 237 238 239 240 241 - 242 - 243 244 245 246 ...