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Seven new β-caryophyllene derivatives, pestalotiphains A-G (1-7), along with six known analogues (8-13), were isolated from the plant-associated Pestalotiopsis hainanensis. Compound 1 represents the first example of a caryophyllene-adenine hybrid, and 2 contains a novel oxatricyclo[4.3.1.0] system. Their structures and absolute configurations were assigned by interpretation of a combination of spectroscopic data and electronic circular dichroism calculations. Compound 8 exhibited moderate inhibition of HL-60 and THP-1 cell lines (IC50,