Fig. 4.
The overlay of IR spectra of A zolpidem tartrate, B HPMC K4M CR, C HPMC K15M CR, D HPMC K100M CR, E zolpidem tartrate + HPMC K4M CR blend, F zolpidem tartrate + HPMC K15M CR blend, and G zolpidem tartrate + HPMC K100M CR blend
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