Assertion: β carotene | /r/MadeOf | linear hydrocarbons
Facets:
Source sentences:
text: (a) the carotenes such as β-carotene, which consist of linear hydrocarbons that can be cyclized at one end or both ends of the molecule, and (b) the oxygenated derivatives of carotenes such as lutein, violaxanthin, neoxanthin, and zeaxanthin, known as xanthophylls .