5-trans-17-phenyl trinor Prostaglandin F2a (5-trans-17-phenyl trinor PGF2a) is the 5-trans isomer of 17-phenyl trinor PGF2a (Item No. 16810). It is the free acid form of 5-trans-17-phenyl trinor PGF2a ethyl amide (Item No. 10008132) and 17-phenyl trinor PGF2a dimethyl amide (Item No. 25241). 5-trans-17-phenyl trinor PGF2a is a potential impurity in preparations of 17-phenyl trinor PGF2a.{60579} This item can be used as an analytical standard for the detection and quantification of 5-trans-17-phenyl trinor PGF2a in preparations of 17-phenyl trinor PGF2a.