Sporopolanin
Sporopollenin is a tough and chemically resistant biopolymer found in the cell walls of spores and pollen grains. It is composed of a highly cross-linked network of aromatic compounds derived from phenolic compounds and fatty acids. Sporopollenin is known for its high resistance to biological and chemical degradation, which allows pollen grains and spores to survive for long periods of time in the environment. This resistance to degradation also makes sporopollenin a useful material for forensic and paleontological studies, as it can provide valuable information about past environments and climate conditions.