1. Some alkaloids do not have the carbon skeleton characteristic of their group. 2. They only differ in numbers of carbons in carbon skeleton . 3. As homoserine, its carbon skeleton also finds an important use. 4. The carbon skeletons of many " alpha-ketoglutarate ", which is a citric acid cycle intermediate. 5. The carbon skeletons of DMAPP and IPP have been colored to indicate their location in GPP. 6. All endogenous progestogens are characterized by their basic 21-carbon skeleton , called a pregnane skeleton ( C21 ). 7. Ginsenosides that are a member of the oleanane family are pentacylic, composed of a five ring carbon skeleton . 8. In an alkane, each carbon atom has 4 bonds ( either C-C or carbon skeleton or carbon backbone. 9. Most are multicyclic structures which differ from one another in both functional groups, and in basic carbon skeletons . 10. "' 1-Iodomorphine "'is a semi-synthetic narcotic analgesic formed by halogenation of the 1 position on the morphine carbon skeleton . 
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