Figure 1. Chemical structures of compounds 1-3 and compound D (4).
Figure 2. HPLC chromatogram of Prasaplai. 1, compound 1; 2, compound 2; and 3, compound 3.
Figure 3. Artifacts formation versus time for one year of storage.
Table 1. Amounts of artifacts and compound D during the period of 1 year storage.
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