{'fraction_non_alphanumeric': 0.037037037037037035, 'fraction_numerical': 0.005698005698005698, 'mean_word_length': 5.9801324503311255, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Secondary metabolites from Sibiraea angustata

Background: Sibiraea angustata was used as folk medicine in Tibetan-inhabited area of Hengduan Mountains, China. Objective: The secondary metabolites from the leaves and twigs of S. angustata were studied. Materials and Methods: The compounds were isolated and purified using silica gel and Sephadex LH-20 column chromatography. Their structures were identified by spectra analysis. Results: Eight known compounds, including 2 monoterpenoids and 3 triterpenoids, were isolated and identified from S. angustata. Conclusions: Four compounds were isolated from this plant for the first time, and the 13C-nuclear magnetic resonance spectra data and absolute configuration of dihydroneroloxide were given for the first time. Abbreviations used: NMR: Nuclear magnetic resonance; TMS: Tetramethylsilane; ECD: Electronic circular dichroism; CC: Column chromatography; TLC: Thin-layer chromatography; DFT: Density functional theory; TDDFT: Time-dependent density functional theory; PCM: Polarizable continuum model.