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. 2010 Jul 2;2(3):275–290. doi: 10.3390/pharmaceutics2030275

Figure 2.

Figure 2

Raman spectra of theophylline anhydrate and monohydrate. Theophylline monohydrate shows a specific peak at 1171 cm-1, which does not exist for theophylline anhydrate. Both theophylline anhydrate samples show the same Raman spectrum.