Keywords: Chemfm tetrakis 3 4 dialkynyl 3 cyclobutene 1 2 dione.svg Molecular diagram of tetrakis 3 4-dialkynyl-3-cyclobutene-1 2-dione For the oxocarbon Wikipedia article Own 2009-07-14 Jorge Stolfi Carbon oxides Alkyne derivatives Cyclobutene derivatives Macrocyclic compounds |