Fig. 1. The molecular structure (a) and crystal cell (b) of paracetamol

Fig. 2. The Powder XRD pattern (a) and the data previously published (b) ^[15] of paracetamol

Fig. 3. The experimental THz spectra of paracetamol
a: The pure sample; b: The mixed samples with the ratio of 1∶2;c: The ratio of 1∶4

Fig. 4. The experimental and solid-state calculated spectra of paracetamol

Fig. 5. The four vibrational modes of paracetamol

Fig. 6. The THz spectra of paracetamol sample (a) and its commercial tablets (b)