°any of a class of bicyclicheterocycles formed by ring-closure from substituted quinones; examples with isoprene sidechains are the basis of numerous naturally occuring compounds, such as tocopherol.
°any of a class of bicyclicheterocycles formed by ring-closure from substituted quinones; examples with isoprene sidechains are the basis of numerous naturally occuring compounds, such as tocopherol.