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FTIR spectra of (A) all-trans retinoic acid, (B) poly-(octamethylene-citrate) (POC), and (C) poly(octamethylene-citrate-co-retinate) (POCR-16). For atRA, transmission spectroscopy was used, while for polymer films, attenuated total reflectance FTIR on partially polymerized polymer films (2d, 60 °C) was used.
