4 Methyl 2,4 bis(4 hydroxyphenyl)pent 1 ene

4-Methyl-2,4-bis(4-hydroxyphenyl)pent-1-ene (MBP) is a metabolite of bisphenol A (BPA). MBP has potent estrogenic activity in vitro and in vivo, about 1000 times more than BPA. Computer modeling has shown that this greater potency is due to stronger binding to estrogen receptors.

These results suggest that a greater health threat may result from the metabolism of BPA inside the body than from BPA itself.