Structure of Three New Carotenoids with a 3-Methoxy-5-keto-5, 6-seco-4, 6-cyclo-β End Group from the Seeds of Pittosporum tobira

Abstract

Three new carotenoids with a 3-methoxy-5-keto-5, 6-seco-4, 6-cyclo-β end group (1-3) have been isolated from the seeds of Pittosporum tobira. Their structures were elucidated by detailed analyses of nuclear magnetic resonance and UV data.