“…However, the oleane-type triterpene acid contains a methyl group at C-14, but the methyl group was replaced with a methylene group [δ C 15.8, δ H 1.03 (br d, J = 4.0 Hz), 1.29 (o), CH 2 -27) in compound 1 . In addition, correlations of H 2 -27/C-12, C-13, C-14, and C-15 were also observed in the HMBC spectrum, indicating the formation of a cyclopropane ring among C-13/C-14/C-27. , Thus, the planar structure of compound 1 was established as 2,3,16-trihydroxy-13,27-cycloolean-11-en-28-oic acid. The NOESY spectrum (Figure B) indicates that H-2, H-3, H-18, Me-24, Me-25, and Me-30 are β-oriented, while H-5, H-8, H-16, Me-23, H 2 -27, and Me-29 are α-oriented.…”