3d image of pentalene skeletal formula

pentalene bicyclooctatetraene polycyclic hydrocarbon cyclopentadiene ring dilithium pentalenide ligand organometallic chemistry bimetallic complex metal-metal bonds anti-bimetallics proton nmr substance matter material compound component agent stuff reagent functional group precursor synthesis reaction production building block molecule molecular formula skeletal structural structure geometry ball stick atom science scientific research organic chemical tautomer isomer stereoisomer 3d iupac nomenclature name