Figure 9.

Chromatographic peak heights for (a) peaks 1 and 2, and (b) peaks 3-5 for an R-phenylglycine solution stored at 22°C for nine days. Peak numbers as in Fig. 2. Retention times: peak 1, 5.2 min; peak 2, 5.4 min; peak 3, 5.6 min; peak 4, 6.0 min; peak 5, 6.9 min.