Assertion: carotene | /r/MadeOf | the parent hydrocarbon chain
Facets:
Source sentences:
text: They are divided into two groups on the basis of functional groups: carotenes, which contain only the parent hydrocarbon chain without any functional group, such as lycopene, α-carotene, and β-carotene; and xanthophylls, which contain oxygen as the functional group, and include lutein and zeaxanthin.