dcw234 dcw234 dcw234, also known as butyl 4-(butyryloxy)benzoate, is a synthetic nonsteroidal estrogen and a selective agonist of the erβ. it shows modest selectivity in terms of affinity and transactivation for the erβ over the erα. its affinity for the erβ was 3.43 μm and for the erα was 22.5 μm, while it activated the erβ and erα with ec50 values of 1.71–2.5 μm and 19.8–22.5 μm, respectively. as such, its binding selectivity for the erβ over the erα was 7-fold and its functional selectivity for the erβ over the erα was between 10- and 13-fold. dcw234clinical dataother namesbutyl 4-(butyryloxy)benzoateidentifiers iupac name butyl 4-butanoyloxybenzoate cas number723759-26-0pubchem cid1729084chemspider1371590chemical and physical dataformulac15h20o4molar mass264.321 g·mol−13d model (jsmol)interactive image smiles ccccoc(=o)c1=cc=c(c=c1)oc(=o)ccc inchi inchi=1s/c15h20o4/c1-3-5-11-18-15(17)12-7-9-13(10-8-12)19-14(16)6-4-2/h7-10h,3-6,11h2,1-2h3key:lmjdpyajkhnphr-uhfffaoysa-n