Pyrene molecules are formed around giant stars and they are commonly found in space
The recipe for creating space molecules  - short space science news

Pyrene molecules are a class of chemicals found in space, usually around giant stars, but also on earth in fossil fuels. They have a particular chemical structure characterized by four benzene rings containing 16 carbon atoms. Previous attempts to create these chemicals in the lab have managed to produce compounds with 14 carbon atoms, so pretty close, but not the real thing. Now, a team of chemists reports finding the recipe for producing pyrene in the lab. To achieve this, they reproduce the high-temperature conditions around old red giant stars, where the compounds are normally produced.

Read the full story: University of California Berkeley
Scientific publication: Nature Astronomy