Ethanoic pentanoic anhydride

Ethanoic pentanoic anhydride (acetic valeric anhydride)... 

To name acid chlorides (the same idea applies to other halides, but we will encounter these less frequently), we take the name of the acid and replace the suffix with -oyl chloride. So 15.4 is ethanol chloride (but it mostly goes by its common name of acetyl chloride), 15.5 is 3-butenoyl chloride, and 15.6 is benzoyl chloride. Anhydrides are also named for the acids from which they are derived thus, 15.7 is ethanoic anhydride (but commonly goes by acetic anhydride) and 15.8 is benzoic pentanoic anhydride. 

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