5-trans Prostaglandin D2

5-trans-PGD2 is a trans-isomer of Prostaglandin D2, typically present as a minor impurity in commercial PGD2. It is primarily utilized as an analytical standard for impurity quantification. Based on studies of analogous F-type prostaglandin isomers, 5-trans-PGD2 is anticipated to possess biological activity, supporting its use in both in vitro and in vivo research on prostanoid signaling.