methylpiperidinopyrazole methylpiperidinopyrazole methylpiperidinopyrazole (mpp) is a synthetic, nonsteroidal, and highly selective antagonist of erα that is used in scientific research to study the function of this receptor. it has 200-fold selectivity for erα over erβ and 1000-fold selectivity for blocking erα-mediated gene transcription relative to that of erβ. methylpiperidinopyrazoleidentifiers iupac name 4--1h-pyrazol-5-ylidene]cyclohexa-2,5-dien-1-one cas number289726-02-9pubchem cid6604927chemspider5037183chemical and physical dataformulac29h31n3o3molar mass469.585 g·mol−13d model (jsmol)interactive image smiles cc1=c(n(nc1=c2c=cc(=o)c=c2)c3=cc=c(c=c3)o)c4=cc=c(c=c4)occn5ccccc5 inchi inchi=1s/c29h31n3o3/c1-21-28(22-5-11-25(33)12-6-22)30-32(24-9-13-26(34)14-10-24)29(21)23-7-15-27(16-8-23)35-20-19-31-17-3-2-4-18-31/h5-16,30,34h,2-4,17-20h2,1h3key:pftioninvminhe-uhfffaoysa-n