Deli, J.; Matus, Z.; Molnár, P.; Tóth, G.; Szalontai, G.; Steck, A.; Pfander, H. Nigroxanthin (3’,4’-Didehydro-β,γ-Carotene-3,6’-diol), a New Carotenoid Isolated from Paprika (Capsicum Annuum Var. Longum Nigrum). Chimia 1994, 48, 102.