An unprescribed nortriterpenoid with an aromatic E ring, uncanortriterpenoid A ( 1 ), together with fourteen known triterpenoids ( 2 - 15 ), were isolated from the hook-bearing stems of Uncaria rhynchophylla Miq. Based on extensive spectroscopic analyses, the NMR data of 2 , 5, and 10 in CD 3 OD were assigned for the first time, and the wrongly assigned δ C of C-27 and C-29 of 2 were revised. Among the known compounds, 7 , 13, and 15 were isolated from this species for the first time, and 15 represents the first lanostane triterpenoid bearing an extra methylidene at C-24 for the Rubiaceae family. Additionally, compounds 6 and 14 exhibited moderate ferroptosis inhibitory activity, with an EC 50 value of 14.74 ± 0.20 μ M for 6 and 23.11 ± 1.31 μ M for 14 .