Potent luteolytic agent related to prostaglandin F2α, q.v.: Dukes, Walpole, Nature 250, 330 (1974). Prepn: Binder et al., Prostaglandins 6, 87 (1974). Induction of estrus and luteolysis in mares: Cooper, Farr, Vet. Rec. 94, 161 (1974); Berwyn-Jones, Irvine, N. Z. Vet. J. 22, 107 (1974).