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. Author manuscript; available in PMC: 2013 Sep 28.
Published in final edited form as: J Control Release. 2012 Aug 3;162(3):538–544. doi: 10.1016/j.jconrel.2012.07.033

Figure 2.

Figure 2

Infrared spectra of (blue) PolyMorphine 5, (red) diacid 3, and (green) morphine 1, key stretch bands for OH acid, C=O acid, C=O ester, and C=O anhydride are indicated.