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(a) Raman spectra of piracetam form I (Pir I) and form III (Pir III), citric acid (CA), physical mixture of piracetam form III and citric acid (Pir III/CA PM), and piracetam-citric acid cocrystal (Pir III CA). (b) Raman spectra of piracetam form I (Pir I) and form III (Pir III), tartaric acid (TA), physical mixture of piracetam form III and tartaric acid (Pir III/TA PM), and piracetam-tartaric acid cocrystal (Pir III TA).
