Vellozia pyrantha A.A.Conc. is endemic to the rupestrian fields in northern Chapada Diamantina National Park (Brazil). This species has the peculiar characteristic of only producing flowers after a massive fire event occurs in the surrounding areas. This is the first report on the assessment of the chemical composition of Vellozia pyrantha resin, where five cleistanthane diterpenoids (1–5) were identified. Their structures were proposed after careful analysis of ¹H and ¹³C NMR, DEPT 135, HMBC, HMQC, and COSY spectra as well as comparison with the literature. Cleistanthane diterpenoids show great the potential to be used as chemosystematics biomarkers for the genus Vellozia and, therefore, their chemotaxonomic significance is discussed.

Vellozia pyrantha AAConc。是北部查帕达·迪亚曼蒂纳国家公园（巴西）的马齿fields田特有的地方。该物种的独特特征是仅在周围地区发生大火后才开花。这是关于评价黄褐藻树脂化学成分的第一份报告，其中鉴定出5个黄连二萜类化合物（1-5）。在仔细分析¹ H和¹³ C NMR，DEPT 135，HMBC，HMQC和COZY光谱并与文献进行比较后，提出了它们的结构。二十烷锡烷二萜显示出巨大的潜力，可被用作Vellozia属的化学系统生物标记，因此，讨论了它们的化学分类学意义。