No, this stuff is like Cigarette tar
or bitumen, asphalt. Whatever you call road-tar in YOUR state.
It does not "form" life. For our sort of life these things are poisonous carcinogens but cannot easily be metabolised as either energy sources or constructional materials.
It's an organic carbon reservoir, sure, but it's like trying to get the hydrogen out of water, or the Oxygen out of concrete.
PAH's are like the Stellar nucleogenesis chain, and you've reached Fe. It's where you end up. The bottom of the hill. So far, it was a free ride, downhill. NOW you gotta hit things REAL hard to make them move...