Abstract: The ¹³C-NMR spectra of some glycyrrizic triterpenoids, 24-hydroxyglabro -lide (l),24-hydroxyglabrolide diacetate (2),glabrolide acetate (3),and glycyr-rhetic acid (4) are discussed. A full asigment of the ¹³C-NMR signals of the-se compounds are completed.lt is shown that the configuration at C-18 can easily be recognized by inspecting the chemical shifts of two characteristic carbons, C-12 anb C-16. In particular, the signal of C-12 is diagnostically valuable. The shifts of these carbon originateb from the change of the D/E ring juction. The multiplicity of close spectra lines of these compounds are established by proton broad band decoupling, single frequency off-resonance dacoupling anb partially relaxed spectra (PRFT). When proper pulse interval time (r=0.36 sec) was selected, nonprotonated carbon, CH, CH₂,and CH₃, can be easily recognized by PRFT spectra.