👉 The term "sesquisalt" in chemistry refers to a specific type of anhydride, which is a hydroxyl radical (OH) with two hydrogen atoms. These types of compounds are known as sesquihydrins. Sesqui-hydrides are formed when the number of hydrogen atoms in an anhydride increases by one. For example, the nitrogen-containing compound 3-phenylbutane has three hydrogen atoms and is therefore a sesqui-hyd