Fig. 1. Chemical structure of endo-THDCPD

Fig. 2. Preparation reaction of endo-THDCPD

Fig. 3. Chemical structure of exo-THDCPD

Fig. 4. Preparation reaction of exo-THDCPD

Fig. 5. The ¹H NMR spectrum of exo-THDCPD

Fig. 6. The ¹³C NMR spectrum of exo-THDCPD

Fig. 7. The ¹H NMR spectrum of endo-THDCPD

Fig. 8. The ¹³C NMR spectrum of endo-THDCPD

Fig. 9. Comparison of MS spectrometry between endo-THDCPD and exo-THDCPD

Fig. 10. Comparison of infrared spectrum (a) and its partial enlargement (b) betweenn endo-THDCPD and exo-THDCPD

Fig. 11. Comparison of Raman spectrum (a) and its partial enlargement (b) between endo-THDCPD and exo-THDCPD

Fig. 12. The THz spectrum of exo-THDCPD

Fig. 13. The THz spectrum of endo-THDCPD

Fig. 14. Comparison of THz spectrum between endo-THDCPD and exo-THDCPD