$\begin{array}{1 1}(a)\;\text{Polyhydroxybutyrate-CO-} \beta \text{-hydroxy valerate}\\(b)\; \text{Polyglycerate-CO-} \beta \text{-hydroxy vinyl chloride}\\(c)\;\text{Polyhydrate-CO-} \beta \text{-hydroxy valerate}\\(d)\;\text{Polyhydroxybutyrate-CO-} \alpha\text{-hydroxy valerate}\end{array}$
