Biomolecules oxygen-containing functional groups

Figure 3.10 Common oxygen-containing functional groups found in the four major classes of biomolecules. The inserted numbers correspond to the numbering found in the NMR studies.

Thiols (R—S—H) and sulfides (R—S—R ) are sulfur analogs of alcohols and ethers, respectively. Both functional groups are found in various biomolecules, although not as commonly as their oxygen-containing relatives. 

---