Polyporusterone B ((1R,2R,4S,5R,7R,11R,14S,15R)-14-[(2R,3R)-2,3-dihydroxy-6-methyl-5-methylideneheptan-2-yl]-4,5,11-trihydroxy-2,15-dimethyltetracyclo[8.7.0.02,?.011,1?]heptadec-9-en-8-one) 是一种三萜羧酸，从Polyporus umbellatusFries 中分离得到。它对自由基诱导的红细胞裂解 (溶血) 具有抑制作用。