MALDI spectra of (a1) low-molecular-weight range of PLLA (enlarged view below), (a2) high-molecular-weight range of PLLA, and (b) the product extracted with hexane (4°C). [L₇ + Na]⁺ is due to the Na⁺ adduct of l-OLLA with , [C₇ + K]⁺ is due to the K⁺ adduct of c-OLLA with , and [L₇–H + 2Na]⁺ is due to the 2 Na⁺ adduct without proton H⁺ of l-OLLA with .