There is a better article at DOI 10.1126/science.366.6467.782, if you know where to find such things.

When Chemical Vapor Deposition is used to produce simple structures like diamond or graphene, the carbon source is typically methane, with one carbon atom.

These scientists instead used molecules with 6 carbon atoms in a † shape, which deposit to form a more complex structure. Their unofficial name is "U-carbon" (for "unusual"). They suspect that variations of the process could produce hundreds of new allotropes.

Edit: The article from the DOI is also at https://www.sciencemag.org/news/2019/11/next-graphene-shiny-...